New evidence from indicted businessman Lev Parnas related to the White House pressure campaign in Ukraine is escalating a fight over whether to allow witnesses and additional documents in 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’s impeachment trial.

Text messages, handwritten notes and official correspondence turned over under subpoena by Parnas, an associate of Trump’s personal attorney 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, paint a more detailed picture of the smear campaign allegedly sanctioned by Trump that targeted a U.S. ambassador.

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House Judiciary Committee Chairman Jerrold Nadler Jerrold (Jerry) Lewis NadlerHouse passes bill to protect pregnant workers House Democrats postpone vote on marijuana decriminalization bill Attacks against the police are organized and violent MORE (D-N.Y.), one of seven impeachment managers charged with prosecuting the case against the president in the Senate, said “there may very well be” more information from Parnas that is disclosed in the coming days and weeks.

The documents, released Tuesday evening, underscore how investigators continue to gather evidence from key players, despite the House voting last month to impeach Trump on abuse of power and obstruction of Congress.

It’s unclear whether Senate Republicans will allow new evidence in the first phase of the trial or if it will be considered after senators have the chance to question House managers and Trump’s defense team. Senators might also decide not to include the recently revealed documents.

“There is news every day and that will likely be factored in,” Sen. Lisa Murkowski Lisa Ann MurkowskiSenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies McConnell says Trump nominee to replace Ginsburg will get Senate vote MORE (R-Alaska) said of the documents provided by Parnas.

“But what we know is that we will have an opportunity as senators to weigh in at that appropriate time, after the questioning phase, to determine if we need more information. So whether it is by witness, by documentation, or what it may be,” she added.

A senior administration official declined to comment Wednesday on the Parnas documents, saying it was not clear the files would even be part of the impeachment process.

“We don’t have any comment on those documents at this point,” the official said. “That’s something that it’s not clear that it’s even going to be a part of this process and we’re not going to get out ahead of reacting on that right now.”

The trove of documents provided by Parnas offers additional, corroborating details over issues at the heart of Trump’s impeachment, including efforts to remove U.S. 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 and create conditions to push for Ukrainian President Volodymyr Zelensky to announce investigations into former Vice President Joe Biden Joe BidenSenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies Biden says Ginsburg successor should be picked by candidate who wins on Nov. 3 MORE and his son Hunter Biden to benefit Trump’s reelection prospects.

Text messages between Parnas and Robert Hyde, a Trump campaign donor and 2020 candidate in a Connecticut congressional race, refer to Yovanovitch in offensive and derogatory terms. They also suggest the two men had Yovanovitch under surveillance until her departure from Kyiv in May.

The documents say that Giuliani was acting with Trump’s “knowledge and consent” to pursue a shadow foreign policy, with a letter signed by Giuliani asking for a meeting with Zelensky and with the approval of Trump.

Sen. Roy Blunt Roy Dean BluntOn The Money: Trump undercuts GOP, calls for bigger COVID-19 relief package | Communities of color hit hardest financially by COVID-19 | Businesses, states pass on Trump payroll tax deferral Trump undercuts GOP, calls for bigger COVID-19 relief package Businesses, states pass on Trump payroll tax deferral MORE (R-Mo.), chairman of the Senate Rules Committee, said admission of any new evidence is likely to be decided by senators and Chief Justice John Roberts, who is presiding over the trial.

“It sounds like a decision the chief justice and the Senate may have to make,” he said, while downplaying the significance of the Parnas documents.

“My initial view of the evidence last night is, there’s nothing much there that hasn’t been already acknowledged, by either the president or Mr. Giuliani,” Blunt said Wednesday.

Sen. John Cornyn John CornynAirline job cuts loom in battleground states Senate Republicans signal openness to working with Biden Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll MORE (R-Texas), an adviser to Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellObama 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 (R-Ky.), said Senate Republicans have agreed to hold a vote over whether to call witnesses and consider additional evidence after the first phase of the trial.

“What we’ve agreed to do is defer that decision, pending the vote of 51 senators, until after both sides have had a chance to have their say,” he said.

Democrats have seized on the Parnas papers to argue witnesses and documents are needed at the trial, which is slated to start next week.

“Each day that goes by, the case for witnesses and documents gains force and gains momentum,” Senate Minority Leader Charles Schumer Chuck SchumerPelosi orders Capitol flags at half-staff to honor Ginsburg Ginsburg in statement before her death said she wished not to be replaced until next president is sworn in Democrats call for NRA Foundation to be prohibited from receiving donations from federal employees MORE (D-N.Y.) said on the floor Wednesday. “Last night, a new cache of documents, including dozens of pages and notes, text messages and other records shed light on the activities of the president’s associates in Ukraine.”

The fight over calling witnesses will pit Democrats against Republicans, not just over who to call but also whether any witnesses should testify. Former national security adviser John Bolton John BoltonDiplomacy with China is good for America The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep DOJ launches probe into Bolton book for possible classified information disclosures MORE and acting White House chief of staff Mick Mulvaney Mick MulvaneyMick Mulvaney to start hedge fund Fauci says positive White House task force reports don't always match what he hears on the ground Bottom line MORE are viewed as key witnesses by Democrats.

Bolton, one of a few members of the president’s team with firsthand knowledge of the Ukraine pressure campaign, has been described in testimony as referring to Giuliani as “a hand grenade who’s going to blow everybody up” and his dealings in Ukraine as a “drug deal.”

But Democrats would have to weigh calling Bolton with the potential for Republicans to push for testimony from Joe Biden or Hunter Biden.

Republicans have also called for testimony from the anonymous whistleblower, who filed the complaint alleging Trump acted inappropriately on a July 25 phone call with Zelensky to launch investigations into the Bidens.

“I agree the president’s defense lawyers should have the opportunity to suggest witnesses that need to be called,” said Sen. Ben Cardin Benjamin (Ben) Louis CardinPPP application window closes after coronavirus talks deadlock Congress eyes tighter restrictions on next round of small business help Senate passes extension of application deadline for PPP small-business loans MORE (D-Md.). “I think that we recognize bringing in Hunter Biden has no relevancy to the articles of impeachment. It would try to distract — I’m not sure that’s helpful for trial. I’d like to see the president’s lawyers make the relevancy argument.”

Scott Wong, Morgan Chalfant and Jordain Carney contributed.