this is the "cbs overnight news." reporting tonight from the democratic national convention in philadelphia. >> there's breaking news here and not the kind that hillary clinton wants. it's a new e-mail scandal. this time at the democratic national committee. and it has cost the chairman of the dnc her job. florida congresswoman debbie wasserman schultz announced she is stepping down at the end of this convention. nancy cordis begins our coverage. >> wasserman schultz was already a lightning rod for bernie sanders supporters even before these hacked e-mails were made

public. with hillary clinton's camp desperate to bring bernie sanders' supporters into the fold in advance of the convention, the decision was made she had to go. >> debbie wasserman schultz. >> hello, south florida! >> reporter: she announced her resignation a day after introducing clinton and her new running mate in miami. in a statement this afternoon, she said, "the best way for me to accomplish these goals is to step down as party chair at the end of the convention." a handful of the 20,000 hacked e-mails showed her aides musing about how to blunt bernie sanders' momentum earlier this year. in one the dnc's chief financial officer wrote, for kentucky and west virginia, can we get someone to ask his belief? does he believe in a god? he had skated on saying he has a jewish heritage. i think i read he's an atheist. >> nobody has apologized to me. >> reporter: sanders has long argued the dnc, which was supposed to be neutral in the primaries, had its thumb on the

scale for clinton. >> debbie wasserman schultz should not be chair of the dnc. i think these e-mails reiterate that reason why she should not be chair. >> reporter: scott pelley asked clinton about the controversy in her first joint interview with her running mate tim kaine airing tonight on "60 minutes." >> did you know anything about any of that? >> no, and i didn't know anything about it and i haven't read any of those. but i am adamantly opposed to anyone bringing religion into our political process. the constitution says no religious tests, so that is just absolutely wrong and unacceptable. >> reporter: senator kaine spent his sunday attending church in richmond and with his son nat, a marine who deploys to romania tomorrow. >> needed some prayers today. we get some prayers. >> reporter: clinton selected kaine out of about two dozen contenders and he made it clear in miami yesterday --

[ speaking spanish ] >> reporter: that he intends to be her biggest advocate. >> hillary clinton, she doesn't insult people, she listens to them. what a novel concept, right? >> reporter: we learned this afternoon former new york mayor michael bloomberg, who considered his own bid for the presidency, will actually endorse clinton here at the dnc on wednesday. and tonight, scott, bernie sanders seth the debbie wasserman schultz made the right decision by stepping down. he says he's still fully behind hillary clinton and in fact intends to deliver a stem-winder here at the convention on night one tomorrow night. >> nancy cordes in philadelphia, nancy, thank you. we asked hillary clinton about those incriminating party e-mails. just hours after she chose virginia governor tim kaine, i should say, virginia senator tim kaine as her running mate, they sat down with us for their first interview for tonight's "60 minutes."

>> in your view, in the effort in the dnc to favor one candidate or another would have been improper? >> again, i don't have any information about this, and so i can't answer specifically. we ran our campaign. we ran hard. we worked to have as many successes as possible. i'm very proud that we got more votes than anybody else running, including donald trump. and i am very grateful for the campaign that senator sanders ran, because we ran a campaign based on issues, not insults. so i can't speak to what people who were not working for me, who were saying whatever they were saying, i can't speak to that ary can only speak to my campaign. >> senator? >> i was a dnc chair. so during the first obama term. you're not going to find anybody at the dnc or rnc or any political organization who is a complete agnostic who doesn't have an opinion about a conditioned date.

those of us who are in the realm of have opinions about people. but i don't see an effort to put a thumb on the scale to thin one way or the other. i think the vigorous and is proof that these are public servants who were in it for the right reason and i think we're going to be unified going forward. >> madam secretary, did you hear the republican convention chanting "lock her up"? >> i didn't hear it because i wasn't watching. but i certainly heard about it. are yes. >> did you feel threatened by that? >> no, i felt sad. i felt very sad. >> sad? >> i mean, i don't know what their convention was about, other than criticizing me. i seem to be the only unifying theme that they had. there was no positive agenda. it was a very dark, divisive campaign. and the people who were speaking were painting a picture of our country that i did not

recognize. negative, scapegetting, fear, bigotry, smears. i just was so saddened by it. >> president obama is down to his last six months in office and he talked about the race with john dickerson on today's "face the nation." >> in 2008, a lot of your supporters said, look at the way he ran his campaign, if he runs the presidency like his campaign, he's going to be in good shape. why isn't that true for trump? who's run a pretty remarkable campaign, beating 16 other politicians? >> in 2008 i don't think they were referring merely to the fact that i had won. we were really well organized. we had a great culture that there was no whiff of scandal to how we approached getting elected. we told the truth. i do think that the body of work of a person matters. and i would say that i genuinely believe there's never been a

candidate better prepared for the presidency than hillary clinton. >> not eisenhower, not george herbert walker bush? those are pretty -- >> i said more prepared. i didn't say that they were chopped liver. but the skill sets that hillary has are similar to many of the skill sets that they had. she knows her stuff. and more than anything, that is what is ultimately required to do a good job in this office. >> president obama with john dickerson. and we'll be right back from philadelphia. ,,,,,,,,,,,,,,

don't expect republican donald trump to keep quiet during the democratic convention. he's already talking to cbs news and here's major garrett. >> reporter: with donald trump and allies counter-programming the democratic convention, ted koppel of "cbs sunday morning" asked trump what he was thinking when he began this campaign. >> i have a sense that back on june 16th when donald trump was thinking was, you know something? i might win a primary or two, i might win a caucus or two, but the worst thing that's going to happen is the brand is going to be improved, i'll be better known, i'll be more famous than i am today, business is going to be -- you never thought you'd be sitting here on this day as the nominee of the republican party. >> i think about it myself, i mean, i think i must have, ted. because i do like to win.

and i believe that if i didn't think i was going to win, i wouldn't have done it. so somewhere deep down in the mind i must have said, i'm going to win. >> reporter: trump won the nomination and remains competitive with hillary clinton, despite skeletal campaign staff and uneven gop convention and prominent party hold-outs. >> what about the elders, the party elders, who didn't show up? the romneys, the bushes, the kasichs? >> look, they're all people i beat for the most part. i helped mitt romney but i think i talked him out of running in this race. he lost a race he should have won. he should have easily beaten a very, very badly damaged president. and i was very critical of him. that's why he came out against me. jeb bush, obviously i beat him very badly. kasich, i beat him very, very badly. kasich was beaten so badly. and it's hard for people to recover. >> reporter: trump denied the gop convention exaggerated the threat of crime at home or terrorism abroad. >> i thought it was very

optimistic. to me it was an optimistic speem. >> what makes it optimistic? >> because we're going to solve the problems. >> reporter: trump also denied he views the presidency as an all-powerful tool of government action, though his acceptance speech indicated otherwise. scott, trump and those close to him refuse to comment on the rampant speculation that recently deposed fox news chairman roger a's will become a trump adviser or take over the campaign entirely. >> major garrett on our philadelphia political team, thank you. with the convention in town, the population of philadelphia is growing by at least 50,000. the city's police force of more than 6,000 officers says it's ready for anything. here's our homeland security correspondent jeff. >> we want a revolution! >> reporter: thousands marched in downtown philadelphia this afternoon. they were noisy but peaceful. in 2000, at the last political

convention here, there were hundreds of arrests. police say they are prepared if demonstrations get out of hand this week. 35,000 to 50,000 protesters are expected each day. the city has purchased over $250 million in insurance to cover potential damage and another $5 million in case any of the city's police officers of sued. the designated protest zone is four miles from downtown within view of the convention site. former philadelphia police commissioner charles ramsey says it's the unexpected that keeps commanders up at night. >> something's going to happen that's going to be unexpected. and how well are you going to be able to handle that? how flexible will you be? >> reporter: in this command center at an undisclosed location, the secret service will monitor what's happening. special agent in charge james henry. >> we prepare for a variety of different scenarios. many, many different types of threats. anything from a lone gunman, an

organized attack, an aircraft that comes into restrictioned air space. >> reporter: we've learned that within the last two weeks the s.w.a.t. teams as well as the counter-sniper teams have put their tactical response plan to the test and they went through several different scenarios, including an attack on a facility, as well as an ambush of a motorcade. scott, one more concern, independent lone wolf attacks. >> jeff begay covering it, thank you. another member of the team is anthony salvanto, director of elections. you've been looking at our polls in battleground states and i wonder did trump's convention change the dynamics of the race? >> he got a small uptick in support. maybe 2 points across the key swing states. that edges him just ahead of hillary clinton. her support held steady. but what's really telling is where this change came from. trump drew in a few conservatives who had been undecided before the convention,

but virtually no one switched his or her votes from clinton to trump. and that illustrates not just how tight this race is but also how partisan it is. >> doesn't look like a big convention bounce. what did the voters tell you that they felt as they watched trump's speech on thursday? >> republicans saw this very differently from everyone else, scott. they called trump's speech hopeful. they said they felt enthusiastic. but independents and democrats were more likely to call it pessimistic. democrats said it made them feel scared. so trump rallied his data but t -- rallied his base. >> are democrats happy with tim kaine? >> there are indications he's seed, but kaine is largely unknown. that sets up this week as a key chance for him to introduce himself democrats. we asked about on the record possible picks clinton might have made, like elizabeth warren. her name was met with much more

enthusiasm, particularly among bernie sanders voters. so it looks like hillary clinton still has some work to do satisfying those progressive voters if she's going to unify the party at this convention. >> anthony salvanto, director of elections, thank you. cbs news primetime convention coverage begins at 10:00 a.m. eastern time, 9:00 central, 7:00 in the west. in another breaking story tonight, explosive wildfires are burning in the west, including two large fires in california inflamed by triple-digit heat and drought-dried brush. what forecasters call a heat dome is smothering much of the nation and here's maria villarreal. >> reporter: fire crews struggled to stop the fast-moving sand fire from gutting over a dozen homes. for three days more than 1,600 firefighters have been battling the blaze in temperatures as high as 110 degrees.

>> that fire came through like a freight train. >> reporter: l.a. county fire chief john tripp. >> all the experiences we've seen with fire, that's all out the window. you've got to look at the four major fires we've had in this county in six weeks. we have seen fires explode all over this county. so that ready, set, go program, it's not words, it's real. >> fire was right here. gigantic flames. houses were circled completely. >> reporter: steve arlen and derek hunt own 650 acres in the affected area. flames destroyed several structures used in dozens of hollywood films and tv shows like "the gambler" and "nightrider." >> at some point you know you're defeated and you have to step back. we fought as best we could. helicopters were dropping, water, everybody was out there doing their best to save it. >> reporter: like california, much of the nation is dealing with overwhelming heat. from chicago to philadelphia, a sweltering heat wave has

temperatures lingering well over 100 degrees. today race organizers in new york altered their course because of the extreme heat. triathletes found the fastest way to find relief was in the hudson river. temperatures here in california are a bit cooler than they have been in the last few days. homeowners were expected to come back home, but an unexpected shift in the wind has picked up the flames you see behind me. that is forcing a lot of officials to make sure those evacuation orders stay in place. >> maria villarreal, thanks. next, were others involved in the mass shooting in munich? and russia's olympic team learns if it will be banned from if it will be banned from brazil. jill and kate use the same dishwasher. same detergent. but only jill ends up with wet, spotty glasses. kate adds finish jet-dry with five power actions that dry dishes and prevent spots and film, so all that's left is the shine. for better results, use finish jet-dry.

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police in munich are questioning a 16-year-old friend of the teenager who went on a shooting rampage on friday. he killed nine before taking his own life. seth doane has been looking into why. >> reporter: german plers say david alisome bolly had been preparing his attack for more than a year. the 18-year-old was bullied at school, suffered from depression, and spent two months in a psychiatric hospital. he apparently shot his nine victims at random.

investigator robert heimburger told us at this point they have not established a clear motive. >> you say he was obsessed with mass killings. was there a turning point when you realized that indeed he was planning one himself? "we cannot say if there is an exact point in time," he said. "but in 2015 he started conducting research on mass killings." some bolly visited the site of a 2009 mass shooting where another teenage gunman killed 15 people. police say he was an avid fan of violent video games. but in real life, he seemed timid. >> the boy lived just across the street? >> yes. >> reporter: hawken runs a hair salon near where the gunman lived with his family. "he was shy, even when i was cutting his hair he wouldn't talk much. he wasn't weird, he was just quiet." the teen purchased his glock handgun illegally online and

fired 57 shots, including the one to his head, which killed him. the teenage killer wrote a manifesto that was so long the police have not yet been able to analyze it. it appears he was not motivated by any ideology. scott, the police told us, simply he was a young, mentally ill man. >> seth doane reporting, thank you. next from philadelphia, will the russians compete in rio?

russia caught a break today when the international olympic committee stopped short of banning all russian athletes from the rio olympics because of widespread doping. instead, the organizations that run each sport will make the decision on who can compete. russia's track and field team was previously banned and that remains in effect. baseball's hall of fame inducted two heavy hitters today. ken griffey jr. played 22 seasons with the mariners, reds, and white sox. he hit 630 home runs. that was good for sixth place all-time. mike piazza hit a record 396 homers as a catcher. not bad considering that he was picked by the dodgers in the 62nd round of the 1988 draft.

political insight from,,,,,,

joining us in philadelphia, one of the founding fathers of television convention coverage, bob schaffer. bob, what does hillary clinton have to do here? >> well, i think she has to be very careful. because you know, when donald trump was in cleveland, he really came down hard on terrorism and all that. the people in the hall liked him. but outside the hall, some people were frankly frightened by all of that.

and she has to be careful not to totally discount the threat of terrorism. people are worried about terrorism. she cannot discount it entirely just in order to put down him. but the other thing, scott, is the chaos in which this convention is getting under way. i mean, this has been a year of surprises but if you had told me that this convention was going to open in chaos, the democratic national committee chairwoman was going to resign over yet another e-mail scandal, and then the clinton people say they're hearing from experts this is the fault of russians and the that the russians may have been doing this to help donald trump, i mean, this is above my pay grade. i don't know, i just wouldn't have predicted this. >> speaking of trump, he hasn't toned anything down. >> he's not only not toned it down, he's ratcheted it up. today when chuck todd asked him would he support a democrat over

former ku klux klan leader david duke, who's going to run for the senate, he said, yes, he would support a democrat, but he'd want to know who the democrat was. i mean, i've never heard anybody qualify an answer quite like that. and then yesterday -- >> bob, thank you very much. that's "the overnight news" for this monday. for some of you, the news continues. for others check back for the morning news and "cbs this morning." from the site of the democratic national convention in philadelphia, i'm scott pelley.

this is the "cbs overnight news." >> welcome to "the overnight news." i'm meg oliver. the delegates are gathering in philadelphia for tonight's opening of the democratic national convention. hillary clinton and her running mate tim kaine will get the formal nomination of the party faithful to head the democratic ticket in the november election. before they travel to philadelphia, the running mate sat down with scott pelley for "60 minutes." >> madam secretary, did you hear the republican convention chanting "lock her up"? >> lock her up, lock her up! >> well, i didn't hear it because i wasn't watching. but i certainly heard about it, yes. >> did you feel threatened by that? >> no, i felt sad. >> sad? >> i felt very sad, scott.

i mean, i don't know what their convention was about, other than criticizing me. i seem to be the only unifying theme that they had. there was no positive agenda. it was a very dark, divisive campaign. and the people who were speaking were painting a picture of our country that i did not recognize. negative, scapegetting, fear, bigotry, smears. i just was so saddened by it. >> he called you crooked hillary. what do you call him? >> i don't call him anything. and i'm not going to engage in that kind of insult-fest he seems to thrive on. so whatever he says about me, he's perfectly free to use up his own air time and his own space to do. i'm going to talk about what he's done, how he has hurt

people in business, time after time after time. his vicious language against immigrants. his insulting a distinguished federal judge of mexican heritage. his mocking a person with a disability. his really inflammatory language about muslims, about american muslims, about muslims all over the world. his demeaning comments about women. i'm going to respond to what he has said that i think is so fundamentally at odds with who we are as a nation, where we need to be heading in the future, and the kind of dangerous, risky leadership that he's promising. >> can i say this? i don't want to -- she's done a good job of letting the water go off her back on this. that's not the way i feel. when i see this crooked hillary

or i see the lock her up, it's just ridiculous. it is ridiculous. the republican fbi director makes a decision that there's nothing here that warrants any additional activity -- >> no criminal prosecution. >> so they're going to say, okay, we don't believe him now. you saw all these folks trying to rehash the tragic deaths of americans in libya, which we should all feel for those families, they're trying to politicize it. >> what's your responsibility for benghazi? did you make any mistakes around that? >> well, scott, there have been i think now nine separate investigations, and they did not find any such culpability. i took responsibility, i was secretary of state. and i thought that was appropriate. and what i was determined to do is to find answers as to what actually happened, not what

people claim, and what we could do to try to prevent that. that is in the tradition of what has happened in the past. we've had horrible losses in beirut, when ronald reagan was president. one of my favorite former predecess predecessors, george schultz, was secretary of state. we had a democratic congress. they didn't politicize it. so when this happened in benghazi, i immediately stood up an independent committee, distinguished americans, military and civilian experts. they came out and they said, you know, the ball was dropped in security. and some of the decisions that were made probably should have been rethought. >> but wasn't that your ball to carry? >> no, it wasn't. it was not my ball to carry. read the reports. read all of the reports, alm hundreds of pages of them, including this latest one, which was a political exercise from the very beginning. those never reached me. those never came to my attention. >> the concerns about the

security never came to your attention? >> no, the experts -- we have security experts. i am not going to substitute my judgment for people who have been in the field, who understand what our men and women are up against. so this has all been investigated over and over again. but as tim was just saying, it didn't get the result that some of the republicans wanted, so they kept at it. and i feel very sorry that they have politicized it unlike any prior example. and i just think the most important challenge we face is learning from it and doing everything we can to keep our people safe. >> i've got about three more questions that shouldn't take too long. one of them you might actually like. >> then we'll take one question. >> exactly, yes. >> all right. do you think you blew it on the e-mails? >> oh, i've said i did, absolutely.

i made a mistake. i should have had two accounts, one for personal and one for office. and i didn't. and i take responsibility for that. >> why did you do that? have the private e-mail servers? >> you know, scott -- other people did have, other secretaries of state, other high-ranking members of administrations, plural. and it was recommended that it would be convenient. and i thought it would be. it's turned out to be anything but. >> would there be a private e-mail server in the white house? >> i'll tell you one thing, that is one lesson i have learned the hard way. and there will not be any such thing in the white house. although i am quick to add there's no evidence that it was ever hacked. and unfortunately, you can't say that for a lot of the government. >> i was speaking to a young african-american man just the other day in a democratic state. and he said, and i'll quote, "you know, i guess i would vote for hillary, except for that

corruption problem." as i talked to him further, he didn't quite know what he meant by that. but that was his impression and concern. why do you think people say that about you? >> well, first, i will take responsibility for any impression or anything i've ever done that people have legitimate questions about. but i think that it's fair to say there's been a concerted effort to convince people like that young man of something. nobody's quite sure what. but of something. i often feel like there's the hillary standard and then there's the standard for everybody else. >> we'll have more of scott's interview with hillary clinton and tim kaine tomorrow. and of course cbs news will bring you primetime coverage of the democratic convention throughout the week. but in two minutes, john dickerson wil will sit down with president obama to discuss what

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the democratic party national convention will be gavelled to order this evening in philadelphia. the delegates will formally nominate hillary clinton and tim kaine to lead the party in the november election. the man they hope to replace, president obama, sat down with john dickerson of "face the nation." they discussed life in the white house and life ahead. >> when donald trump spoke to his convention, he talked about the security threats. he painted a very dark picture. now there's been a terrorist attack in germany. doesn't that suggest he's right about the darkness? >> no, it doesn't. terrorism is a real threat. and nobody knows that better than me. i've been spending most of my days over the last seven and a half years coordinating our intelligence, our military, our

diplomatic efforts, to crush organizations like al qaeda and now isil. it is going to be an ongoing threat for some time. but what we've been able to do i think is to build coalitions with other countries to make sure that rather than have 180,000 troops overseas, fighting a nonstate actor that we've got special forces and intelligence assets and local partners and isil is being defeated in syria and iraq, but we're going to have circumstances in which small cells, individuals, are going to be able to do some harm to innocent people. and we've got to do everything we can to prevent it. one of the best ways of preventing it is making sure that we don't divide our own country. that we don't succumb to fear. that we don't sacrifice our

values. and that we send a very strong signal to the world and to every american citizen that we're in this together. >> explain how we would sacrifice our values specifically by being divided. >> well, look. if we start engaging in the kinds of proposals we've heard from mr. trump or some of his surrogates like mr. gingrich where we start suggesting that we would apply religious tests to who could come in here, that we are screening muslim-americans differently than we would others, then we are betraying that very thing that makes america exceptional. and that by the way has helped to insulate us from some of the worst patterns of terrorist attacks, because the

muslim-american community here feels deeply american and deeply committed to upholding the rule of law. and working with law enforcement. and rejecting intolerance and extremism that's represented by the perversions of islam that isil is sending out through the internet or carrying out in the middle east. but that requires leaders, political leaders, religious leaders, business leaders, all of us, to send a very clear signal that we are not going to be divided in that fashion, and i think the kinds of rhetoric that we've heard too often from mr. trump and others is ultimately helping do isil's work for us. >> he was the chief birther in america, questioning whether you -- what's your reaction to the fact that he's the nominee of the republican party?

>> well, i think -- i think it says something about what's happened to the republican party over the course of the last eight, 10, 15 years. if you think about what a bob dole or a jim baker or a howard baker or a dick lugar or a colin powell stood for. they were conservative, they were concerned about limited government and balancing budgets and making sure we had a strong defense. but they also understood that our system of government requires compromise, that democrats weren't the enemy, that the way our government works requires us to listen to each other.

and that's not the kind of politics that we've seen practiced. i think all too often. >> do you think the majority of american people feel safe, that the world is safer after -- >> well, i think right now we've gone through a really tough month. and that happens sometimes. we've had a terrorist attack in orlando, although it does not appear externally motivated, but a deranged man killing scores of people. you've had the tragedies that happened in minnesota and baton rouge. police officers targeted, both in dallas and baton rouge. and the senseless violence that took place in nice. if that's what you're consuming, that's what you're seeing on a day-to-day basis for the last month, i think it's understandable that people are concerned. what i think is important for leaders to do is to let the

american people know they are right to be concerned, we've got to make sure that our police officers are protected in a very tough job, that our criminal justice system operates the way it should and without bias, that we're doing everything we can to go after terrorists, but it's also important for the american people to remember that our crime rate in this country is much lower than it was in the '80s or the '90s or when i first took office. that immigration rates are substantially lower than they were when ronald reagan was president. that as serious as these terrorist attacks are, the fact of the matter is that the american people are significantly more safe now than they were before all the work that we've done since 9/11. and so maintaining that

perspective i think is absolutely critical. and trying to fan fears simply to score political points i think is not in the best interests of the american people. >> you had a very strong reaction to donald trump's criticism of you for not using the phrase radical islam. but in 2008 when you were a candidate for president, you did use the term radical islam. why did you stop? >> you know, this is an interesting example of where something that shouldn't be an issue gets magnified. the fact of the matter is that i've never been politically -- or particularly concerned with the phrase. what i've been more concerned about is how do we stop violent extremists from killing us? the reason that i haven't used the particular phrase "radical islam" on a regular basis is because in talking to muslim

allies, in talking to the muslim-american community here, that was being heard as if we were ascribing to crazy groups like isil or al qaeda the mantle of islam. and since we need them as allies, i think it's useful for us to listen to how the president of the united states words and messages are being received. because if we're going to defeat those organizations, we need help from the billion-plus muslims in this world so that they can help root out this perversion of islam that's taken place. >> speaking of allies, donald trump had a response and a view about nato. >> yes. >> he said if the baltic nations were attacked that he might not defend unless they were paying their dues. you've talked about free riders, countries that rely on u.s.

defense without pulling their share. so why aren't those similar thoughts, if not playing out a little bit differently, but the same thought? >> well, i think that anybody who's been paying attention knows there's a big difference between challenging our european allies to keep up their defense spending, particularly at a time when russia's been more aggressive, and saying to them, you know what, we might not abide by the central tenet of the most important alliance in the history of the world, one that was built by democrats and republicans and has been a cornerstone of u.s. foreign policy since the end of world war ii. for mr. trump, who has in the past suggested that america's weak and not looking out for its allies, to then maybe not have

enough information or understanding to go out and say that america might not stand by its solemn commitment to protect those same allies who stood with us after 9/11 when we were attacked, i think is an indication of the lack of preparedness that he's been displaying when it comes to foreign policy. >> we'll have more of john's interview with the president tomorrow. or see the full report on. website, cbsnews.com. scott pelley will bring you primetime convention coverage from philadelphia all week long. "the overnight news" will be "the overnight news" will be right back. today you can do everything in just one click, even keep your toilet clean and fresh. introducing lysol click gel. click it in to enjoy clean freshness with every flush. lysol. start healthing. ♪ yeah, click

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if you a dry mouth can be ations common side effect. that's why there's biotene. it comes in oral rinse, spray or gel, so there's moisturizing relief for everyone. biotene. for people who suffer from a dry mouth. with the olympics in rio set to open a week from friday, authorities in brazil say they've broken up a terror cell threatening to target the games. ten people were arrested at towns and cities across the country. ben tracy has the latest. >> reporter: with the eyes of the world folk skulsed on rio the olympics present an irresistible target for terrorists. brazil's defense minister says the men arrested were in the preparation phase of their plot. although no particular olympic site was mentioned. authorities say the men were involved in an online group

called the defenders of sharia, did not know each other personally, but were talking about getting weapons and martial arts training. >> there is a concern about terrorism. >> reporter: robert mugga is a security expert in rio. >> brazil is an enormous country, there's no surveillance in many areas of the country. you've got countries on the border which we know illegal goods are being trafficked. >> reporter: brazil's federal police are monitoring about 100 people for possible links to terror groups, mainly along the border in paraguay and argentina, where weapons easily and often flow into the country. for the past week security forces have been conducting high-profile drills in rio, training for attacks on the city's trains and airport. 85,000 police and soldiers will patrol the city during the games. due in part to a recent surge in muggings and shootings in rio. but these arrests make it clear

rio will have to be ready for multiple threats. >> in today's world you never know. the distributive nature,,,,,,,,,

the republican presidential ticket is already out on the stump. and the democratic party national convention is about to get under way in philadelphia. chief washington correspondent emeritus bob schaffer has some thoughts on what lies ahead on the campaign trail. >> reporter: the main thing we found out about donald trump at the cleveland convention is that he'll be running in the fall campaign as donald trump. >> i am your voice! >> reporter: as we learned from his acceptance speech, he won't be softening the edges, won't be cleaning up his act, won't be changing his style. >> we cannot afford to be so politically correct any more. >> reporter: the emerging trump strategy is focused on one thing and one thing alone, raising

hillary clinton's negatives. >> death, destruction, terrorism, and weakness. >> reporter: if he can convince people that she is worse than he is, then he wins. and it might work. >> i want my candidacy to unify our country. >> reporter: this may be why trump has rejected the conventional wisdom -- >> america is the rising nation -- >> reporter: that american elections are won by the most optimistic, uplifting candidates. instead, he painted a dark view of american life, said americans are living through one international humiliation after another, and blamed most of it on hillary clinton. >> america is far less safe and the world is far less stable -- >> reporter: he said he alone could fix it but gave few details on how. he presided over a convention notable more for who didn't show

up than who did. >> honestly, he should have done it -- >> reporter: and just friday got in a post-convention row with primary rival ted cruz, telling him he not only didn't want his endorsement but threatened to raise money to defeat him if he ran for re-election to the senate. when democrats gather in philadelphia later this week, we'll get a better fix on what approach hillary clinton will take. already some are urging her to take the same approach as trump. make it about him, not her. however that comes out, it won't be a pretty picture. this campaign is shaping up as one of the nastiest and dirtiest in american history. and we've had some bad ones. that's the "overnight news" for this monday. for some of you the news continues. for others check back with us a little later for the morning news and "cbs this morning." from the broadcast center in new york city, i'm meg oliver.

captioning funded by cbs it's monday, july 25th, 2016. this is the "cbs morning news." drama before the first gavel at the democratic national convention. the party's chair is stepping down after leaked e-mails reveal party leaders plotted sabotage against bernie sanders. this morning, who the clinton camp is blaming for the leak. as clinton looks to shake off the controversy on the convention's first day, she joins her running mate side-by-side for their first joint interview. >> senator, you're going to be vice president in a white house with two presidents. >> i mean, it's an embarrassment of riche