Sen. Susan Collins Susan Margaret CollinsJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally Momentum growing among Republicans for Supreme Court vote before Election Day MORE (R-Maine) said Tuesday that she was not yet prepared to endorse President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE’s reelection bid in 2020.

The senator told "PBS NewsHour’s" Judy Woodruff that she was focused on her own reelection in 2020 and was not paying much attention to the presidential campaign.

"I'm not prepared at this point to make that decision,” Collins said.

Woodruff asked if Collins would endorse the president between now and Election Day.

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“I don’t know, I’m going to have to see what happens between now and then and look at what his record is,” Collins said. "I can’t imagine that I would endorse any of the Democrats who are running right now, but I’m going to focus on 2020 in 2020.”

Collins said she is “neither ruling it in nor ruling it out” when it comes to endorsing a Republican challenger to Trump.

.@JudyWoodruff: "Are you, at this point, prepared to endorse President Trump?"@SenatorCollins: "I'm really focused on my own [re-election] campaign for 2020, and I really haven't focused on the presidential campaign. So, I'm not prepared at this point to make that decision." pic.twitter.com/b31DzPJ9L3 — PBS NewsHour (@NewsHour) January 29, 2019

The Maine Republican said last month that there was “nothing wrong” with Trump facing a primary challenge.

"I see nothing wrong with challengers," she said on CNN's "State of the Union." "That is part of our democratic system."

She has now become a top target for Democrats in 2020 after she provided her GOP colleagues with the crucial 50th vote needed to confirm Supreme Court Justice Brett Kavanaugh Brett Michael KavanaughMomentum growing among Republicans for Supreme Court vote before Election Day Remembering Ginsburg's patriotism and lifelong motivation Collins: President elected Nov. 3 should fill Supreme Court vacancy MORE.

A fundraising effort to fund Collins’s future Democratic opponent raised more than $3.7 million.