Sen. Susan Collins Susan Margaret CollinsThe Hill's Campaign Report: Biden asks if public can trust vaccine from Trump ahead of Election Day | Oklahoma health officials raised red flags before Trump rally Gideon leads Collins by 12 points in Maine Senate race: poll Senate leaders quash talk of rank-and-file COVID-19 deal MORE (R-Maine), a potential swing vote in the Senate impeachment trial, on Wednesday questioned why House Democrats have waited until now to release documents from a key witness claiming that President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE had “knowledge and consent” of efforts to pressure Ukraine to investigate former Vice President Joe Biden Joe BidenCast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response Biden tells CNN town hall that he has benefited from white privilege MORE.

Senate Democrats have called the new evidence — handwritten notes by Lev Parnas, an associate of Trump’s personal lawyer Rudy Giuliani Rudy GiulianiGrand jury adds additional counts against Giuliani associates Lev Parnas and and Igor Fruman Juan Williams: Breaking down the debates Giuliani criticizes NYC leadership: 'They're killing this city' MORE — a significant new revelation.

But Collins on Wednesday did not appear moved by a note on Ritz-Carlton stationery stating Parnas’s chief objective was to ensure “the Biden case will be investigated.”

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The documents were released Tuesday along with other primary evidence by the House Intelligence Committee, which spearheaded the impeachment inquiry.

“I wonder why the House did not put that into the record and it’s only now being revealed,” Collins told reporters when asked if the evidence changes her view on the need to hear from additional witnesses in the forthcoming trial.

When informed that Parnas only turned over the evidence last week, Collins said that mostly serves to show the House impeachment inquiry was rushed.

“Doesn’t that suggest that the House did an incomplete job, then?” she asked, adding that she will consider the question of witnesses at a later date.

“I do think that, as I said, it’s important that we have an up-or-down vote on the issue of subpoenaing witnesses and documents,” she said.

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Senate Minority Leader Charles Schumer Chuck SchumerMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security Warren, Schumer introduce plan for next president to cancel ,000 in student debt Schumer lashes out at Trump over 'blue states' remark: 'What a disgrace' MORE (D-N.Y.) said earlier Wednesday that the newly released documents "paint a sordid picture" of Giuliani and his associates’ efforts to remove former Ambassador to Ukraine Marie Yovanovitch Marie YovanovitchGrand jury adds additional counts against Giuliani associates Lev Parnas and and Igor Fruman Strzok: Trump behaving like an authoritarian Powell backs Biden at convention as Democrats rip Trump on security MORE, who has called for an investigation.

"Just when you think that President Trump and his network couldn't get possibly any more into the muck, reports suggest they are even dirtier than you would have imagined," Schumer said.

"To allegedly have some cut-rate political operative stalk an American ambassador at the direction of the president's lawyer, potentially with the president's 'knowledge and consent' ... I mean, how much more can America take in the decline of our morals, our values, our standing in the world?" he added.