Sen. Susan CollinsSusan Margaret CollinsGraham: I hope Dems 'get their ass kicked' for conduct around Kavanaugh St. Lawrence alumni, faculty want honorary degree for Collins revoked 'Suspicious letter' mailed to Maine home of Susan Collins MORE (R-Maine), speaking from the Republican National Convention, on Tuesday said she may vote for Democrat Hillary ClintonHillary Diane Rodham ClintonBudowsky: Closing message for Democrats Election Countdown: Dems outraise GOP in final stretch | 2018 midterms already most expensive in history | What to watch in second Cruz-O'Rourke debate | Trump raises 0M for reelection | Why Dems fear Avenatti's approach GOP mocks Clinton after minor vehicle collision outside Mendendez campaign event 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 TrumpFive takeaways from Cruz, O'Rourke's debate showdown Arpaio files libel suit against New York Times IMF's Christine Lagarde delays trip to Middle East 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.