Sen. Susan Collins Susan Margaret CollinsSenate GOP set to vote on Trump's Supreme Court pick before election Democratic senator to party: 'A little message discipline wouldn't kill us' Poll: 57 percent of Americans think next president, Senate should fill Ginsburg vacancy MORE (R-Maine), a key vote in the upcoming Senate impeachment trial, is distancing herself from Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellHawley warns Schumer to steer clear of Catholic-based criticisms of Barrett Senate GOP set to vote on Trump's Supreme Court pick before election Harris slams Trump's Supreme Court pick as an attempt to 'destroy the Affordable Care Act' MORE’s (R-Ky.) close coordination with President Trump Donald John TrumpBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Pelosi: Trump Supreme Court pick 'threatens' Affordable Care Act MORE’s legal team.

Collins, who is seen as the Senate Republican most likely to vote for an article of impeachment, made clear to reporters Monday that she is not in close consultation with the White House like McConnell and other Republicans.

Collins has maintained since the launch of the formal House impeachment inquiry that she takes her role as a juror very seriously and has held back from commenting on various developments out of an abundance of caution.

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She said McConnell’s plan to let Trump’s legal team dictate the Senate GOP’s position on the trial “would not be the approach that I’ve taken.”

“The only people I’ve consulted with thus far are experts from the Congressional Research Service,” she added. “I sat down with them for a session last week.”

The moderate Republican senator made her comments in response to a question about McConnell’s remarks in an interview with Fox News host Sean Hannity Sean Patrick HannityWill Chis Wallace's debate topics favor Biden over Trump? Former Florida attorney general calls Kyle Rittenhouse 'a little boy out there trying to protect his community' Sunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election MORE. McConnell told Hannity that he is in lockstep with the White House on trial strategy.

“Everything I do during this, I’m coordinating with the White House counsel,” he said. “There will be no difference between the president’s position and our position as to how to handle this to the extent that we can.”

Collins also criticized Senate Minority Leader Charles Schumer Chuck SchumerPelosi: Trump Supreme Court pick 'threatens' Affordable Care Act Will Democrats attempt to pack the Supreme Court again? Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' MORE (D-N.Y.) for writing McConnell a letter on Sunday and then leaking it to the press.

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Schumer is trying to pressure McConnell into calling four additional witnesses.

Collins called Schumer’s maneuver “unfortunate.”

“It seems to me unfortunate that Sen. Schumer wrote a letter which he released to the press prior to his sitting down and having the kind of discussion with Sen. McConnell” that Senate leaders had ahead of former President Clinton’s 1999 impeachment trial, she said.

Collins said, “I’m not going to reach a judgment” on the need for witnesses “until I see what the two leaders come up with for a suggestion.”