More than a dozen Republicans have announced they will not vote for Donald Trump on Election Day, a day that was expected to be an historic one for the GOP.

The most important of the potential defections are from South Carolina Sen. Lindsey Graham and Nevada Sen. Dean Heller, who are both viewed as a potential future 2020 Republican presidential candidate.

Graham and Heller, two senators with long histories of opposition to Trump, have been vocal in their support of his candidacy.

Graham told Fox News’ Sean Hannity on Tuesday night that he is “a little concerned” about Trump’s campaign, and he has not decided yet whether he will vote for the Republican presidential nominee.

In a series of tweets on Tuesday, Graham said he believes the election will be “very close,” and he expects the GOP to “go in a different direction.”

He continued: I have been very concerned for a while now, and I am a little concerned.

This is a very important election and I don’t want it to be decided by the people of my state.

If I had to vote, I would not vote Republican, because I don,t believe we should elect a president who will attack the families of people killed in the line of duty.

Graham is one of the most outspoken Republicans to say that he will not be voting for Trump.

On Monday, the South Carolina senator said he is not a Trump supporter because he believes “he will not take care of the American people.”

He said that the GOP’s “primary message” is “We are not going to fix this.”

In Nevada, Heller’s position on Trump has not changed, saying that he believes Trump has “done some pretty good things in this campaign,” but that he does not believe he will support the GOP nominee.

The Nevada Republican also said he has “serious reservations about [Trump] in general,” and will vote “no” on Tuesday.

Nevada Gov.

Brian Sandoval, another likely 2020 Republican candidate, told Fox Business’ Maria Bartiromo that Heller is “one of the more important senators out there right now.”

“He’s the one who’s going to stand up for him, who’s the guy who’s got the most ability to make a decision,” Sandoval said.

“I think he’s one of those people that we need in the Senate.

I’m hoping that he gets the nomination, but I don`t think he can win the nomination.”

Nevada Republicans have also said they will likely not support Heller, and Sen. Mark Amodei, a member of the Senate Republican caucus, told CNN’s Jake Tapper on Tuesday that Heller will not get the nomination.

“He will not,” Amodee said.

The Arizona senator, a former state legislator and former state attorney general, has also been outspoken in his support of Trump.

“The best thing that can happen to the GOP right now is to stop and say, ‘Enough is enough,'” Amodein said.

Nevada Republican Sen. Brian Schatz has also indicated that he won’t support Trump on Tuesday due to his reservations.

He told CNN on Monday that “everybody has a right to say they are not a Donald Trump supporter.”

“I’m not going anywhere.

I don�t think it is going to matter who the nominee is.

I think we’re going to be a unified party.

I believe we are going to win the election, and that’s the best thing for the country.”