Sen. Susan CollinsSusan Margaret CollinsTrump pitches new plan to reopen government amid Dem pushback The Memo: Concern over shutdown grows in Trump World Overnight Defense: Trump unveils new missile defense plan | Dems express alarm | Shutdown hits Day 27 | Trump cancels Pelosi foreign trip | Senators offer bill to prevent NATO withdrawal MORE (R-Maine), speaking from the Republican National Convention, on Tuesday said she may vote for Democrat Hillary ClintonHillary Diane Rodham ClintonConservatives pound BuzzFeed, media over Cohen report BuzzFeed story has more to say about media than the president Trump knocks BuzzFeed over Cohen report, points to Russia dossier MORE for president.

"I have always supported the nominee of my party, my entire life, and it is extremely unlikely that I would vote for Hillary Clinton, but I'm not completely closing the door, but it is extremely unlikely," Collins told CNN.

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"It is more likely that I would decide to write in a candidate or choose another approach."

Collins made clear that she also isn't ruling out voting for presumptive GOP nominee Donald TrumpDonald John TrumpSunday shows preview: Shutdown negotiations continue after White House immigration proposal Rove warns Senate GOP: Don't put only focus on base Ann Coulter blasts Trump shutdown compromise: ‘We voted for Trump and got Jeb!’ MORE.

"We still have a ways to go, and I do believe in redemption," she said.

"And there is a chance that he will make amends, start acting more presidential and come up with a positive agenda for our country."

Collins, who has criticized Trump in the past, said previously her decision on whether to endorse Trump may depend on who he chooses as a running mate.

"This evolves daily. There are surprises daily. And I'm going to see what happens at the convention," Collins said earlier.