>> This is all just the beginning.>> As Donald Trump shakes up his campaign team for the second time in two months, Republicans fear voters turned off by Trump could hand Democrats the US Senate as well as the White House. I'm political correspondent John Whiteside here in Washington.
There's a group of Senate candidates that are facing tough reelection fights, as the Republicans try to hold on to their majority in the senate.>> This is the most important election in my lifetime.>> Richard Burr of North Carolina, a Republican senator who has endorsed Trump, he's a conservative running in what had been a conservative state.
But polls show Clinton leading in North Carolina this time around. And Burr is one of those Republicans who's really been hurt by Trump. His race wasn't initially on the radar as a seat the Republicans might lose. Suddenly they're very worried about it.>> We will all be tired.
>> I wanna make sure that we turn this around.>> Kelly Ayotte, the Republican Senator in New Hampshire. She said she supports Trump, but she's not going to endorse him. She's criticized Trump on occasion, mostly recently for his attacks on the Muslim Gold Star family who spoke at the Democratic convention.
Trump, as he often has with many of his fellow Republicans, has had a back and forth with her. He called Ayotte weak in the Washington Post. But then later backtracked and said he supported her in her reelection bid. Senator Mark Kirk said he definitely is not going to vote for Trump.
>> Well, I don't think Donald Trump will make a good commander in chief. He's too emotional.>> Kirk is in a very tight reelection race with Tammy Duckworth, Army veteran who lost her legs and is leading him in most polls. With election day just three months away, Republicans are walking a tightrope trying to deal with Donald Trump and still hold on to their jobs.
>> It's what it is, it's a rigged system!>>