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we begin this hour with a dangerous showdown between the u.s. and iran in international waters. defense officials say the u.s. navy stopped iran from seizing two oil tankers in the gulf of aman. iran apparently at one point fired at one of those tankers. orin lieberman is at the pentagon. tell us what we know happened here. >> reporter: what makes this concerning to the defense department, as we watch what happened here, this plays out in two separate incidents in the gulf of aman, a critical waterway in the middle east. this is as you're heading into the arabian sea. this gives you an idea of the significance of this waterway. at 1:00 a.m. local time the u.s.

navy says an iranian ship approached a commercial oil tanker and approached in a way that led the navy to believe they were intending to seize the oil tanker. an action iran has done in the past. that's perhaps why the u.s. navy intervened. a destroyer approached these two ships. it was during that time as the u.s. navy destroyer approached that the iranian vessel changed course. only three hours later, this plays out. the video you're seeing is another iranian navy vessel approaching another oil tanker in international waters. this time the iranian vessel draws closer and opens fire with small arms fire hitting that tanker in several points. nobody was injured on the tanker according to the u.s. navy. those bullets struck close to the living quarters on board the

tanker. another reason the u.s. was very concerned about this. the same destroyer responded to this one as well. this time there was a distress call coming from the oil tanker. that's why the navy headed towards the scene at full speed. as it approached the iranian vessel heads away from the scene. >> this is a crucial point for oil going through the waterway. was there a direct conflict between the u.s. and iranian warships here? >> reporter: not a direct conflict. the u.s. navy did not open fire in this case. according to the navy, it was only the iranian navy that opening fired, pointing fire at the oil tanker. this is enough to concern the u.s. and why it saw the need to get involved. also, the oil tanker put out the distress call and the u.s. navy specifically has boosted its presence in the region for this reason. having seen in the past multiple at tells by iran to harass or

seize commercial shipping vessels. according to the u.s. navy, since 2021 iranian vessels have tried this about 20 times to either seize, harass or interfere with commercial shipping vessels. i got the notification that we have stills of the bullet holes on board this oil tanker, the richmond voyager. this will give you an idea of the damage to the vessel. that very near the living quarters here. again, another reason why the u.s. navy is concerned about this. worth going back to late april, early may, within days of each other, there were two separate seizures of commercial vessels by iranian ships. that's when the u.s. military bolstered its presence in the region with ships and aircraft. jim? >> we should note on a civilian vessel it's not going to be armored in any way. before we let you go, does the

u.s. know whether it was an attempt to seize or harass? does the u.s. have an assessment as to what iran is trying to accomplish? >> reporter: the u.s. sees these both as attempted seizures. although there was no distress signal in the first incident, there was in the second. according to the u.s. navy, they hailed the richmond voyager and ordered it to stop. the u.s. navy sees this as a seizure. >> of course the danger always escalation, particularly if you have u.s. and iranian forces confronting each other. boris? from the danger of escalation in one part of the world to another. a volatile nuclear standoff is playing out again in europe. ukrainian president volodymyr zelenskyy warns that russia may have planted explosives at the

zaporizhzhia nuclear power plant. u.n. monitors say they see no signs of bombs at the facility. ever since vladimir putin's forces took control on the plant, europe has been on edge about a potential nuclear catastrophic. president zelenskyy says the russians are ready to strike. listen. >> i have intelligence. i have documents. i can't tell you what kind of documents, but it's something connected with russia. i said that they are technically ready to do something. it's very important that they mined some local mines. >> at zaporizhzhia? >> yes. they technically are ready. >> let's go to eastern ukraine with ben weiderman.

ben this is alarming. >> reporter: what we're hearing from president zelenskyy is last night he said the russians placed what appeared to be explosive devices on the roofs of some of the power units at that nuclear power plant. now, previously the head of ukrainian intelligence said that some of the cooling ponds to the reactors had been mined and explosive-laden trucks have been deployed outside four of the plants six reactors. the russians have said it's not true, in fact, it's the ukrainians planning something. now the iaea, which said they've seen no proof of anything at the plant, have said they've requested additional access to those areas that the ukrainians have mentioned as possibly the

site of mines or explosives. the situation very unclear. each side is exchanging accusations. the ukrainians have for a long time warned of an impending disaster at the zaporizhzhia nuclear power plant. certainly the number of claims that something is about to happen there, the russians are planning something, are really coming fast and furious. now the ukrainians are conducting drills. they have conducted drills in the area of zaporizhzhia that they control, as well as several other provinces in the event something happens. boris? >> ben, to put this in broader context, it's unfolding as the ukrainians are early in their counteroffensive. progress has been slow, although they say they're seeing gains in bakhmut. tell us more about that.

>> reporter: this is gains in one village on the outskirts of bakhmut. we've been in touch with troops involved in that particular operation. they do seem to be gaining ground there, but not dramatically. it's as best incremental. that's from the south. from the north they're running into more trouble, more resistance from the russians. what they're trying to do is avoid street battles inside bakhmut. i spent a lot of time there. it would be really difficult, sort of house to house, street to street fighting. they're trying to encircle the city to encourage perhaps the russians to leave and avoid the same sort of bloody street battles that bakhmut saw for the ten months when the russians tried and eventually succeeded in may to take over that city. boris? >> ben, thank you.

officials investigating the monday night shooting in philadelphia found disturbing details in the suspect's social media posts, some posted just hours before he allegedly opened fire. the district attorney said the suspect set out to randomly kill people, shooting people in cars or walking down the street. the suspect is charged with five counts of murder and attempted murder. a 15-year-old boy was among the dead. 2-year-old twin boys are among the wounded. danny freeman is joining us live with the latest details. danny, what do the facebook posts reveal? >> reporter: well, remember one of the big mysteries so far is what led kim brady to go on the shooting spree on monday evening. what we know now is law enforcement is confirming to cnn

that police investigators are looking at the suspect's facebook account and social media history to see if there are clues about a potential motive. we've been looking through the social media. there are a lot of posts about guns, god, freedom and the second amendment the first one i want to show you is from the morning of the shooting on july 3rd. it appears to be a picture of a man in tactical gear holding a rifle. then there were other political messages. there's one from june which is an image of president biden talking about the queen of england and the language says this is y'all president. the second amendment save our rights, now it's god save the queen while he attempts to take our arms. then another thing was there was criticism about the community

patrols and more elder statesmen in the local southwest philadelphia community that mr. carriker lives. we know police are combing through the social media accounts and posts to see if there's any clue about the motive. brianna, you mentioned that the district attorney said, as far as they know, this was essentially a random attack and someone who just woke up and said i want to start killing people. that was in his words, and killing and shooting innocent people just on the street. there was a woman with two twins in the back seat of her car and police allege that this gunman opened fire at this car shooting one of the young twin boys in the back seat. the other sustaining injury from glass fragments. the the suspect was in court today. they read thcharges that include murder, attempted murder, aggravated assault, r

reckless endangerment. at this point mr. carriker's defense attorney -- i'll say appointed defense attorney, they're not commenting on this case. his next court appearance is scheduled for july 24th. we'll bring you more updates as we have it. >> you mentioned that family with the twins. also a 10-year-old boy in the car and charges pertaining to endangering him although he wasn't injured. the mother was injured from the glass as well. we found out there was a police officer who hopped into the jeep with them and got them to the hospital to get the help they needed. amazing story coming out of a senseless tragedy in philadelphia. danny, thank you for the latest. a looming strike that could have a major impact on the u.s. economy. details on the feud between u.p.s. and the teamsters.

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powdery substance found in the west wing on sunday. lab tests confirmed it's cocaine. jeremy diamond is live for us white house. jeremy, any more details about this? >> reporter: yesterday we reported the initial field test showed it was likely cocaine and now we can report a lab test confirmed the white powdery substance has tested positive for cocaine. we're told more details as well about where exactly the powdery substance was found.

it was found at the ground floor entrance to the west wing. it's typically where tour groups, which can come in during the weekend, would pass through in order to get a tour of the west wing and near where there are cubbies where people are asked to leave cell phones. that's an important piece of information. staffers as well with proper badges can pass through this area. we don't know yet who brought in baggy of cocaine into the white house. a secret service investigation is ongoing. we know the president was nowhere near this. he was at camp david over the weekend and returned to the white house yesterday. we'll be pressing the white house press secretary in just a few minutes for more details. we know this tested positive for cocaine according to a lab test. it was found inside the west wing and the investigation is still ongoing. >> are they operating under the assumption this is related to someone who went on a tour of

the west wing? >> reporter: look, don't know yet where this investigation is pointing. just when you look at some of the location details of this, the fact it was found near one of these places where visitors are asked to leave their cell phones could be some indication, but we just don't know at this point who is responsible for this. >> it's a place where people are emptying their pockets, bringing their phones out to put in cubbies. all right. we'll be looking for more details. meantime on capitol hill a house divided. republican moderates are butting heads with house conservatives over whether to launch impeachment proceedings against president biden. caught in the middle house speaker kevin mccarthy as he might face an effort to oust him as a speaker. let's discuss with ron brownstein. ron, thanks for being with us.

lay it out for us. why would republicans pursue impeaching president biden if the senate is controlled by democrats? is this just about messaging? >> well, look, there's a threshold question before that. what would be the grounds on which to pursue impeachment? nancy pelosi faced calls to impeach donald trump literally from the time democrats took over the house. they impeached donald trump when he tried to extort the government of ukraine to manufacture dirt on biden and later when he tried to instigate an insurrection. they didn't impeach him on his policies. this is largely based on the fact that biden is failing at the southern border. do you impeach a president over that? also, that the administration has impeded the investigation

against hunter biden. this is more of what we've seen over the last 25 years, in each party, especially the republican party, there's enormous pressure. we've seen all sorts of barriers broken, whether it was mitch mcconnell holding a security s supreme court seat for an entire year, but impeaching a president would be an escalation. >> it's not just president biden that house republicans have their sights on. there's a number of officials including the vice president, the attorney general, three cabinet secretaries and the fbi director. these are the faces of all the individuals that some house republicans are targeting. is it likely they will have the numbers to impeach any of these officials? >> it's a really good question. so far the mccarthy strategy by and large in this first year of the republican majority has been to make his concessions

primarily to the right and assume that the republicans who are in more swing districts, the 18 in districts that biden carried, another group that are in districts that trump carried narrowly, he's assuming they'll go along in the end. this may be a bridge too far for them. i wouldn't rule out that if republicans in more swing districts force the party to climb down from the idea of impeaching biden, they may feel pressure within the party to support the impeachment of someone else, which has obviously been enormously rare as well. again, it goes back to the question. is impeachment a tool for a policy disagreement? is that the era of american politics that we're moving into? it may be. you should not minimize what an enormous break that is from the past, an enormous escalation. >> you alluded to the

difficulties mccarthy is having wrangling all the different factions within his party. what are the chances the freedom caucus moves forward to vacate him as speaker? >> from their point of view they have more leverage with the threat than carrying it through. it's not true they have an alternative they could put into office, that they could engineer a speaker they would enjoy better. in many ways mccarthy is kind of protected by the shear division in the republican caucus. i don't know if they have a better alternative than him, but they like having him on edge. as i said, by and large his strategy has been to make concessions to the right, assume the swing districts will go along. i suspect that's his posture going forward as well. >> ron, i want to get your thoughts on the 2024 campaign. it does not appear donald trump to this point is campaigning at

the pace that he did in 2016 and 2020. he still maintains a head and shoulders lead above everybody else. what do you make of this more laid back strategy? >> well, i think it's pretty common for a frontrunner who has the kind of lead that trump does. trump's lead in national poling is about as big as we've seen six months before the vote. boris, we are in a different era in terms of the primaries. it used to be that you could burrow into iowa or new hampshire and build a local con constituency if you did relentless campaigning. dick gephart literally moved to iowa for the caucuses. that's less true now. we have a national contest that plays out in the early states. the voters there are consuming the same national media. they're responding to the same

dynamics. it's probably less essential than it used to be to be out there, although those voters guard their first in the nation status aggressively and it means a lot to them. you show respect for it. i will point out in every contested republican race since 1980 the frontrunner lost in iowa or new hampshire. lately it's iowa. the last three times the frontrunner was defeated there. each time the frontrunner came back to win the nomination. i think voters don't want to end the process too quickly. they know if they vote for the frontrunner, it's almost a coronation. trump may have more to worry about in iowa than new hampshire. >> ron brownstein, appreciate the insight. jim? >> ron always has good stories. prosecutors say a man with weapons went to barack obama's d.c. neighborhood after donald trump posted what he claimed was

the former president's address. we'll have details just ahead.

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♪ ♪ we have new details just in to cnn about a man arrested last week with weapons in the neighborhood of former president barack obama in washington, d.c. federal prosecutors say the suspect began live streaming in that area after he shared a social media post from donald trump in which trump posted what he claimed was obama's address.

kaitlan collins joins me now. did the former president share something close to former president obama's address? >> reporter: he put this man in an area the secret service was protecting in a neighborhood where the obamas live. >> within a few blocks. >> reporter: it appears to be in the neighborhood itself according to court documents. what's concerning about this is that that wasn't when this guy was on the radar of investigators or federal protection, the fbi. they had been monitoring him because he participated in january 6th allegedly. there are videos of him. he was posting on youtube about being an insurrectionist and had a series of live streams in the month of june talking about january 6th, his participation, as well as saying threatening things like he wanted to blow up his car outside of a federal

building the day before he goes to this neighborhood in washington, d.c. there was an incident where he was live streaming talking about january 6th inside of an elementary school in maryland. this all comes together and on a live stream. the feds watch him walk through the neighborhood. he's streaming. he's saying he has them surrounded, presumably the obamas, and then he takes off on foot. they arrested him in a wooded area nearby. >> hold that thought for a moment. i know you have more reporting on the indictment against former president trump, and that there might be a less redacted version of that indictment. >> reporter: we're waiting to see if there are more details about the investigation that led to this indictment. back whenever the fbi did that search of mar-a-lago last year, they had to submit a detailed affidavit in court saying this is why we believe we'll find evidence inside mar-a-lago. after that search, we got a version of that court document

that had a lot of redactions in it. now that trump has been indicted cnn went back to court and asked for a version with fewer redactions. a judge told the justice department we'll get to see another version of that paper. >> i want to bring in national security analyst juliette keim on the question of a former president sharing what turned out not to be the exact address of the obamas, but in the neighborhood, put this suspect in the neighborhood there and the suspect considered enough of a threat that he was taken in by secret service protecting the former president. is that a dangerous thing for a former president to do, to share with his followers that information? >> when i heard this story, i was thinking about the moments after president biden became president and he denied donald trump access to present national

security briefings and now i th think it was precedent. forget mar-a-lago and the classified information he took, donald trump knows exactly what he is doing. he puts out what's allegedly an address or something close, or in the neighborhood, that's close enough for me. it certainly will be close enough for the secret service. he's not doing that for neighborly brotherhood. he's doing that because his followers will do something with it. most will ignore it, but he knows there's some of them that will do something. trump can claim plausible deniability, i just put this out there. we have seven years of him doing this. he did it again against a former

president and not surprising that the person who took the bait is someone who also followed him on january 6th. >> so, let me ask you bigger picture so folks at home can understand the seriousness of this. there's a deep problem with right wing extremism in this country. the fbi not just under this administration, but the previous one, has identified domestic extremism as the greatest national threat. you have a former president sharing information that someone in one of those groups might then use. if you were looking at this from your former perch at the department of homeland security, would you consider that person, in this case the former president, as aiding and abetting a threat by doing that? >> aiding and abetting would be hard because trump could say i wasn't directing them towards something. what you could look to for trump

is him assisting this environment and the solution may not be a legal prosecution. that's different than say january 6th where there might be evidence of a direct involvement with the violence. in this case, what it takes from a sort of counterterrorism perspective because i view this in that lens, that you have someone inciting violence against democratic institutions and our democracy, you do the things that are being done. these prosecutions are significant, even against the guys that were at january 6th, the low level guys. it makes it harder for their to be recruitment and fund-raising, but the thing that's not happening enough. i can't say it enough. there has to be a certain amount of shaming of what trump is doing by his people. that's what you don't see right now from the republican party. you see some of it and it's important. that will go very far to say, as

we've seen in other instances where a party abandons a president, that this is not a sustainable -- this is not reflective of who we are. unfortunately we're not seeing that enough. >> right. i mean, establishing here the degree of the former president's help here, as it were. no one seems to be debating the degree to which the former president is discouraging this anger, and in this case sharing information that someone with that anger might use. juliette keim, good to have you on. i want to go to the white house. moments ago president biden speaking with the swedish prime minister. this an important meeting between the two leaders. discussing the war in ukraine, but also sweden's possible academa ascession to nato, something

this president supports. have a look. >> everyone in? prime minister, good to see you. you're a valued, valued friend. i want to welcome you. sweden is a capable and committed partner. together we're preparing our relationship to go further. we're also prepared for the nato summit next week. the united states fully, fully supports membership in nato. the bottom line is simple. sweden is going to make our alliance stronger and you have

the same value set as we have in nato. looking forward to your membership. with that bilateral relationship sweden and the united states are taking on the challenges that matter most to our people. from taking on the climate crisis, to preserving freedom in the indo-pacific. we seem to agree on almost everything. we're stepping up to protect our shared democratic values, including providing assistance to ukraine. the generosity of the swedish people has been extreme. you've done a great, great deal to help ukraine defend itself against russia. together our countries and companies are working in lockstep with emerging technology. want to thank you, mr. prime minister, for your work on 5g networks, 6g networks and i want

to thank you for being here. i yield to you, mr. prime minister. >> thank you so much, mr. president. thank you so much. i really do appreciate this. thanks for the kind invitation. it's highly valued to us. i believe that sweden and the u.s. share so many values and priorities. that goes for how to handle the war in ukraine. i thank you for your leadership. the transatlantic unity you have made so much to establish. also how to tackle the climate crisis. that goes for handling the transatlantic -- the problem that china creates for our

democracies. we highly appreciate your strong support for sweden's nato ascession. that means a lot to us. i very much look forward to our talks. thank you so much. >> reporter: mr. president, what makes you confident -- >> one at a time. >> reporter: mr. president -- >> reporter: how confident are you -- >> everyone come this way please. everyone, please come this way. >> reporter: mr. president, how important -- >> come this way.

>> reporter: how confident are you that -- >> we need everyone to exit. >> reporter: mr. president -- >> we need to begin the meeting. thank you so much. >> we've been watching there tape from moments ago in the white house, president biden meeting there with the swedish prime minister. key at this point because the u.s. supports sweden's succession to nato. turkey has still not made clear if and when it will remove its opposition or its slow rolling. hungary another holdout has said they'll no longer stay in the way. stand by. we're going to go back to the white house.

they're discussing another story this morning, the discovery of cocaine in a visitor area of the white house. >> the president and the first lady and the family was not here this weekend. you also know they left on friday and returned just yesterday. where this was discovered is a heavily travelled area where many white house -- west wing i should be more specific -- west wing visitors come through this particular area. i don't have anything more to share. it's under investigation by the secret service. this is in their purview. we'll allow the investigation to continue and we have confidence that the secret service will get to the bottom of this. >> reporter: has the president said let's get to the bottom of what happened? >> we have confidence that the secret service is going to get to the bottom of this. the president follows the reporting here. he was briefed by his staff on everything that we know so far. the secret service is

investigating this, investigating what happened over the weekend. we have confidence they'll get to the bottom of it. >> reporter: is there still a chance that sweden will be approved into nato by the time of next week's summit? >> this is something that the president -- the sweden prime minister is here. they're meeting right now. some of your colleagues were in the oval office. we've been clear on this. we've encouraged turkey and hungary to approve sweden's application for nato membership as soon as possible. sweden -- i said this last week -- has fulfilled the commitments they made under the trilateral agreement. they agreed on the margins of the nato summit. sweden is a strong, capable defense partner that shares nato's values and will strengthen the alliance and

contribute to european security. we believe this should occur. their partnership -- them to become members of nato as soon as possible. that's what you'll continue to hear from the president. i think the sweden prime minister being here today having a meeting with the president shows that commitment. >> reporter: just two quick followups. you said the president was briefed on the cocaine found at the white house. is the white house conducting its own internal investigation? >> it's under the purview of the secret service. they handle the investigation. it lives in their purview, in their world. >> reporter: quick follow on this type of tour. can you explain to the american people who would have access to the west wing and what protocols are in place? >> when it comes to security protocol, that's something the secret service is going to handle. that's a question to them. when it comes to visitors to the west wing, we have west wing

tours that occur here on campus. they happen in the past couple days, friday, saturday and sunday. the times they do not happen is when there's a federal holiday like yesterday. there was not a west wing tour. also, when there's a large white house event. i don't have anything more to share on the particulars. again, when it comes to security, when it comes to anything of those types of protocols, it's something that the secret service handles. >> reporter: karine -- >> congratulations. should i call you -- >> reporter: sure. >> i was waiting. incoming president. >> reporter: i wonder if the cocaine episode has prompted the white house to ask the secret

service to rescue its security protocol? >> let's let them do their investigation. this is under their purview. let's see exactly what occurred. they're going to get to the bottom of this. they, meaning the secret service. not going to get ahead of changes in protocol. let's let the secret service do their job. we have all the confidence they'll get to the bottom of it. >> reporter: this kind of shines a light on the fact that you can bring in illegal substances into the white house. what's preventing a visitor from bringing in anthrax or something? >> i totally understand the question. it is under investigation. we'll get to the bottom, the secret service will. we'll let the secret service do their job. we're not going to get into ifs or changes. we have to let the secret service do their job. >> reporter: could you tell us

how the white house is assisting the secret service with its investigation? have you made white house officials available for interviews? >> we're not assisting in everything. it's under the secret service purview. it's their guidance and guidelines, their world. we're going to let them do their job. we are not involved in this. this is something that the secret service handles under their protocol. they'll investigate and get to the bottom of what happened. we appreciate that. >> reporter: you noted this is an area where visitors on tour groups pass by. is that the working theory that it was likely a visitor and are you confident this was not a white house staffer? >> there is investigation. they'll get to the bottom of this. i want to be very clear is it's a heavily travelled, to be more accurate, area of the campus of the white house. it is where visitors come to the west wing. this is the part where they come

through when coming through the west wing. i don't have anything else. i'm not going to speculate. i want to make that very clear and give you more information. i believe the secret service is sharing this as well. >> reporter: on another topic, among the 12 palestinians killed in the jenin operation, four were under the age of 18. israel says they were all combatants. does the white house have an assessment of whether they were combatants or whether civilians were killed? >> here's what i'll say -- we've said this many times. we support israel's security and right to defend against hamas, palestinian jihad and other terrorist restore critical services like electricity and water to the civilian population and so don't

have anything more to share beyond that. certainly we are monitoring very closely. >> is there anything you can tell us about the level of engagement by u.s. officials to try to prevent a broader escalation with regard to rockets fired from gaza? we've seen this attack carried out in tel aviv. what is the white house doing to prevent this? >> israel is a close ally and partner and we are in touch with the national security and certainly the defense officials so don't have anything to read out on our conversation. but we are in regular contact. i'll go to the back. go ahead. >> thanks. >> we've been listening to the white house briefing addressing a number of topics, one including ongoing white house support for sweden's succession about the number of children killed, as well as the number of

children killed in the west bank in recent days. finally as well, an update there on the investigation into the cocaine found on the white house. the press secretary saying it was found in a heavily traveled area but they are leaving any discussion of increased security measures, et cetera, to the secret service. >> we'll have to wait and see what they find, jim. in the meantime, some really alarming findings in the search for answers surrounding a medical mystery in professional sports. scientists in australia have diagnosed the world's first case of cte in a professional female athlete. an autopsy on the former australian football league player found low stage signs of the degenerative brag disease cte. anderson was just 5 years old when she started playing football. she went on to play contact sports for nearly two decades. these are finding that could help shed light on one of the most underreported and largely undetected injuries in athletes. joining us now, the ceo of the

legacy foundation and the co-founder of the australian sports brain bank where this case was diagnosed. so tragic here, too. she passed away just last year, dying by suicide which has been the case, we've seen with some of the victims of cte and ultimately, this is something that is diagnosed posthumously. can you tell us about what the brain bank found in the case of heather anderson and why these findings are so significant? >> yes, heather anderson's story is very tragic. she'll leave remarkable legacy of opening up our eyes to what is also happening in women's sports. the brain bank team led by the doctor identified multiple lesions throughout her brain that are cte. an an normal form of protein in the brain. and i h this serves as a rallying cry and a call to action for we will's sports.

they haven't really been part of the conversation about what we should do about this disease because we haven't had somebody to talk about and somebody to focus on. hopefully we can take this moment and start a conversation, start acknowledging that we've known for decades that men's sports caused cte but now we know some women's sports will cause it as well. >> so she had at one point had a confirmed concussion, probably conservative other concussions that were unconfirmed. and let's be clear. aussie rules football is a very, very tough sport. perhaps no surprise with how much contact she had there. what i think is misunderstood is that it doesn't necessarily take a concussion to cause damage. can you explain that? the sort of repetitive sub concussion level impacts that can cause damage that leads to this? >> that's a great question. so whale this is the first case in a female athlete, our team at

boston university just published a study of 631 deceased american football players. the most important finding people need to recognize is that there was no correlation between whether or not they had cte and the number of concussions they had. but there was oord correlation between the number of times we think they were hit in the head and the strength of those impacts based on the positions they played. so i think we've sort of, we no longer need to think about it as being caused by concussions. they contribute with you maybe only in a very small way. it is simply a math question. like smoking and lung cancer. how many cigarettes you smoked and how much cancer-causing chemicals were in there and that's your odds of developing the disease later in life. >> are we as a society taking this seriously enough? are sports leagues taking this seriously enough? i'm talking amateur professional and youth leagues. >> not at all. unfortunately, many sports are

still in denial that their sport causes cte. so while 20 years ago, we had to fight over recognizing concussions and now every sport has a concussion protocol, we're still trying to get sports recognizing their sport causes cte and then put in what we would suggest is a cte prevention protocol. we published the first one last month. a concussion protocol will do nothing to prevent cte. we limit the number of hits to the head and the strength of hits to the head in games and in practices. we need to prevent it. most sports don't have this conversation. they're still letting kids play tackle at age 5 when we know those hits in some of them, if they go on long enough, will cause cte. and i was at a conference with all the american soccer organizations in may.

and soccer is probably the number one sport in america we have to worry about for women. and they still don't recognize it. and all those headers could cause cte. so we have a lot of work to do if we don't want to continue to identify cte in the brains of athletes. especially women. >> it's so important for men and for women, for all athletes, for children, grown-ups and we really appreciate you sounding the alarm and talking with us about this today. thanks. >> thank you. we are continuing to follow a developing story. the defense department says the u.s. navy intervened to stop iranian navy ships from seizing two oil tankers in separate incidents in the gulf of oman. new details when we come back. ♪ limu emu & doug ♪

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now to some major developments in the middle east. a u.s. defense official said the navy foiled multiple attempts by iran to seize two oil tankers in the gulf of oman. iran o