Sen. Susan Collins Susan Margaret CollinsMcConnell locks down key GOP votes in Supreme Court fight Most Americans think winner of election should pick next Supreme Court justice: poll Murkowski: Supreme Court nominee should not be taken up before election MORE (R-Maine), speaking from the Republican National Convention, on Tuesday said she may vote for Democrat Hillary Clinton Hillary Diane Rodham ClintonBiden leads Trump by 36 points nationally among Latinos: poll Democratic super PAC to hit Trump in battleground states over coronavirus deaths Battle lines drawn on precedent in Supreme Court fight 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 Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards 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.