>> that's phenomenal! narrator: terrorism here at home. fourteen americans killed in a san bernardino mass shooting...

for banning assault weapons, and banning high-capacity ammunition clips. and pat toomey? against an assault weapons ban and against banning high capacity ammo clips like those used in the orlando massacre. listen to pat toomey brag: "i have had a perfect record with the nra." pat toomey gets an "a" from the nra. he's not for you. senate majority pac is responsible for the content of this advertising.

san bernardino mass shooting... but after this tragedy - when pat toomey had the chance to ban suspected terrorists from buying guns - he voted against closing this loophole for terrorists - and with the gun lobby. katie: we have to do everything in our power to keep guns away from terrorists who threaten our way of life. i'm katie mcginty and i approve this message because we can't risk our families' safety on a loophole.

the real story on pat toomey. on background checks for gun buyers... toomey has shown the courage few others have... toomey steps up on checks... toomey is on the right side... state leaders should follow toomey lead. no wonder leading pennsylvania police organizations endorse pat toomey as best to protect our families. independence usa pac is responsible for the content of this advertising.

special tax breaks. saving oil companies twenty-four billion dollars. and big oil polluters have given toomey seven hundred thousand dollars in campaign contributions. tax breaks for them. campaign contributions for him. pat toomey. he's helping big oil polluters and millionaires. not the rest of us. lcv victory fund is responsible for the content of this advertising.

generals do. john mccain, a war hero. he's not a war hero, he's a war hero because he was captured. i like people that weren't captured ok. donald trump compared his sacrifices to the sacrifices of two parents who lost their son in war. how would you answer that father? what sacrifice have you made for your country? i think i've made a lot of sacrifices, built great structures. i've had tremendous success, i think... those are sacrifices?

content of this advertising.

just minutes. "i'm...i've got a whole chapter in my book where i... specifically lay out how i think we should... reform social security." toomey's plan requires wall street and bankers to manage... the accounts. collecting fees out of your social security that could... total billions. fees they collect, even if the market crashes and... seniors lose everything. pat toomey's looking out for wall street, not pennsylvania. dscc is responsible for the content of this advertising.

wheeler-dealer, overseeing stock trades in new york, london and tokyo. next, toomey moved to hong kong to work with wealthy chinese investors. in the senate, it's no surprise toomey's been siding with wall street. voting to allow banks to continue making the risky investments that wrecked our economy. pat toomey. he's for wall street. not us senate majority pac is responsible for the content of this advertising.

out pat toomey's record... >> no. would you like to name it? and we saw a guy who has our backs. toomey crossed party lines to support background checks.... that keep guns out of the hands of criminals and terrorists. true independence, and real guts. that's how pat toomey is helping us, keep you safe. senator pat toomey, the best choice to protect pennsylvania. independence usa pac is responsible for the content of this advertising.

on nbc.

to turn up the heat. >> i will consider it a personal insult, an insult to my legacy if this community lets down its guard and fails to activate itself in this election! you want to give me a good sendoff? go vote! >> reporter: as president obama tries to unify democrats, there are new rifts this morning among republicans. the rnc chairman, reince priebus, this weekend saying that it is time for donald trump's former primary opponents to come on board and support his campaign, suggesting they could

fix the problems we face. well i don't believe that's how you get things done in our country. it takes democrats and republicans working together. that's how we got health care for 8 million kids. rebuilt new york city after 9/11. and got the treaty cutting russia's nuclear arms. we've got to bring people together. that's how you solve problems and that's what i'll do as president.