However, she says she will not campaign against her former colleague and the Democratic presidential nominee Joe Biden.
In an interview with the New York Times, Collins said, “I do not campaign against my colleagues in the Senate.” She added that she knows Biden “very well” and that she feels campaigning against him would violate her rule.
Collins and Biden served in the Senate until 2009 when he began his tenure as vice president.
Still, she said, “My inclination is just to stay out of the presidential and focus on my own race.”
Her refusal to publicly state whether or not she will vote for Trump is a break from 2016 when she said she would not vote for him.
Collins has been a target for Democratic operatives since she voted to confirm Supreme Court Justice Brett Kavanaugh.
Despite winning her re-election in 2014 with 69% of the vote, her opponent Sara Gideon (D) has repeatedly outraised her.
According to an average of polls from RealClearPolitics, Gideon holds a 2.5% lead over Collins.
And Biden leads Trump by double-digits in Maine.