Senate Minority Leader Charles Schumer Chuck SchumerDemocrats scramble on COVID-19 relief amid division, Trump surprise Pelosi, Schumer 'encouraged' by Trump call for bigger coronavirus relief package Schumer, Sanders call for Senate panel to address election security MORE (D-N.Y.) quickly seized on former national security adviser John Bolton John BoltonThe 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 Gary Cohn: 'I haven't made up my mind' on vote for president in November MORE's decision to testify, if subpoenaed, as part of President Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE's impeachment trial, arguing on Monday that it puts new pressure on Republicans to support calling witnesses.

“Momentum for uncovering the truth in a Senate trial continues. John Bolton correctly acknowledged that he needs to comply with a Senate subpoena to compel his testimony, if issued. It is now up to four Senate Republicans to support bringing in Mr. Bolton, and the other three witnesses, as well as the key documents we have requested to ensure all the evidence is presented at the onset of a Senate trial," Schumer said in a statement.

"Given that Mr. Bolton’s lawyers have stated he has new relevant information to share, if any Senate Republican opposes issuing subpoenas to the four witnesses and documents we have requested they would make absolutely clear they are participating in a cover up," Schumer added.

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Bolton is one of four witnesses that Senate Democrats want to call as part of Trump's impeachment trial.

Bolton did not appear before the House and was not subpoenaed as part of the impeachment inquiry after his lawyers made clear he would not appear without a subpoena and that he would want a court to resolve the question of whether he could be forced to testify.

Speaker Nancy Pelosi Nancy PelosiPowell warns failure to reach COVID-19 deal could 'scar and damage' economy Overnight Defense: House to vote on military justice bill spurred by Vanessa Guillén death | Biden courts veterans after Trump's military controversies Intelligence chief says Congress will get some in-person election security briefings MORE (D-Calif.) on Monday also called on Trump and Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellSenate 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 The 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 MORE (R-Ky.) to allow for witnesses as part of the impeachment trial in the upper chamber in the wake of Bolton's offer.

"The Senate cannot be complicit in the President's cover-up," she said in a tweet.

The President & Sen. McConnell have run out of excuses. They must allow key witnesses to testify, and produce the documents Trump has blocked, so Americans can see the facts for themselves.



The Senate cannot be complicit in the President's cover-up. #DefendOurDemocracy https://t.co/TQLJsfn0f5 — Nancy Pelosi (@SpeakerPelosi) January 6, 2020

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Bolton announced in a statement on Monday that he would testify if he is subpoenaed by the Senate, a decision that immediately sent shockwaves through Washington.

"The House has concluded its Constitutional responsibility by adopting Articles of Impeachment related to the Ukraine matter. It now falls to the Senate to fulfill its Constitutional obligation to try impeachments, and it does not appear possible that a final judicial resolution of the still-unanswered Constitutional questions can be obtained before the Senate acts," Bolton said in a statement.

"Accordingly, since my testimony is once again at issue, I have had to resolve the serious competing issues as best I could, based on careful consideration and study. I have concluded that, if the Senate issues a subpoena for my testimony, I am prepared to testify," he added.

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Bolton did not indicate what he was prepared to tell senators if he is called to testify.

He witnessed key moments leading up to and following the July 25 call during which Trump asked Ukrainian President Volodymyr Zelensky to investigate a debunked theory about Kyiv’s involvement in the 2016 Democratic National Committee server hack as well as former Vice President Joe Biden Joe BidenThe Memo: Warning signs flash for Trump on debates Senate Republicans signal openness to working with Biden National postal mail handlers union endorses Biden MORE and his son Hunter Biden’s business dealings in Ukraine.

Bolton allegedly described efforts by administration officials to press Ukraine for the investigations as a “drug deal,” according to witness testimony.

It would take 51 senators to call Bolton to testify as part of the impeachment trial. All 47 Democrats are expected to back subpoenaing him, meaning they'll need to win over four Republicans.

No GOP senator has specifically endorsed having Bolton testify, and McConnell has specifically said he does not believe either Trump's team or the House impeachment managers should call witnesses.

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) said last week that she is "open" to witnesses but that a decision on who, if anyone, should be called should wait until after initial arguments and senators are given a chance to ask questions.