A majority of Maine voters said they believe that President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE abused his power, according to a poll released Wednesday as the Senate impeachment trial moves forward.

Fifty-three percent of Maine voters said Trump is guilty of abusing the power of his office for his personal benefit by withholding military aid to Ukraine in an effort to push the nation to announce an investigation into a potential opponent in this year’s election, according to a poll by the Garin Hart Yang Research Group obtained by The Hill,.

Politico first reported on the poll.

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The poll results indicate some of the pressure Sen. Susan Collins Susan Margaret CollinsSenate Republicans face tough decision on replacing Ginsburg Democratic senator calls for eliminating filibuster, expanding Supreme Court if GOP fills vacancy What Senate Republicans have said about election-year Supreme Court vacancies MORE (R-Maine) faces during the impeachment trial. Collins is facing a tough reelection race in 2020.

The poll found that 40 percent of Maine voters surveyed said Trump is not guilty of abusing power, and an additional 7 percent said they are not sure.

Among independent voters, a key group for Collins, 57 percent said Trump is guilty of abusing the power of his office compared to 36 percent who did not, based on the poll.

Additionally, the poll found that 71 percent of Maine voters surveyed said that senators should “insist” on seeing documents and calling witnesses as part of the trial, and just 23 percent said that is not important.

The Senate voted 53-47 Tuesday on a rules resolution for the Senate impeachment trial, with Collins voting along party lines.

Democrats were unsuccessful in their attempt to get language added that would have included a deal at the beginning of the trial on witnesses and documents related to the delayed Ukraine aid.

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The resolution allows for a later vote on whether to subpoena witnesses and documents.

“As I said last week, while I need to hear the case argued and the questions answered, I anticipate that I would conclude that having additional information would be helpful,” Collins said in a statement Tuesday. “It is likely that I would support a motion to subpoena witnesses at that point in the trial just as I did in 1999.”

As the impeachment process moves forward, Collins is facing her toughest election yet. The Cook Political Report ranks her race a “toss up,” and she faces a strong Democratic challenger in Sara Gideon, the Speaker of Maine’s House of Representatives.

The poll surveyed 800 likely voters in Maine between Jan. 14-19. The Hill reached out to Garin Hart Yang Research Group for additional information. The polling firm is the political division of Hart Research and works with Democratic candidates and progressive caucuses.

The survey was commissioned and released by Senate Majority PAC, a super PAC dedicated to building a Democratic majority in the U.S. Senate.

--This report was updated at 12:27 p.m.