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.) on Monday renewed his call for key Trump administration figures to testify during the Senate impeachment trial in the wake of a New York Times report detailing the White House’s efforts to withhold nearly $400 million in military aid to Ukraine.

“Simply put, in our fight to have key documents and witnesses in a Senate impeachment trial, these new revelations are a game changer,” Schumer said at a press conference just a day after the Times published an explosive story offering new details about some White House officials’ actions in blocking Ukrainian military aid.

The report showed the role officials such as acting White House chief of staff Mick Mulvaney Mick MulvaneyOn The Money: House panel pulls Powell into partisan battles | New York considers hiking taxes on the rich | Treasury: Trump's payroll tax deferral won't hurt Social Security Blockchain trade group names Mick Mulvaney to board Mick Mulvaney to start hedge fund MORE played after Trump directed his administration to withhold the aid. Among other things, it showed that Mulvaney and Robert Blair, assistant to the president and senior adviser to Mulvaney, were aware that the move would prompt backlash from Congress.

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The Times also noted that Trump declined to release the aid despite appeals from former national security adviser John Bolton John BoltonJudge appears skeptical of Bolton's defense of publishing book without White House approval Maximum pressure is keeping US troops in Iraq and Syria Woodward book trails Bolton, Mary Trump in first-week sales MORE, Secretary of State Mike Pompeo Michael (Mike) Richard PompeoWatchdog confirms State Dept. canceled award for journalist who criticized Trump Trump's push for win with Sudan amps up pressure on Congress Putin nominated for Nobel Peace Prize MORE and Defense Secretary Mark Esper Mark EsperOvernight Defense: Stopgap spending measure awaits Senate vote | Trump nominates former Nunes aide for intelligence community watchdog | Trump extends ban on racial discrimination training to contractors, military Overnight Defense: Pentagon redirects pandemic funding to defense contractors | US planning for full Afghanistan withdrawal by May | Anti-Trump GOP group puts ads in military papers Official: Pentagon has started 'prudent planning' for full Afghanistan withdrawal by May MORE.

"This new story shows all four witnesses we Senate Democrats have requested were intimately involved and had direct knowledge of 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 decision to cut off aid in order to benefit himself," Schumer said.

"And when you combine these new revelations with the explosive emails from Michael Duffey released last weekend, it makes the strongest case yet for a Senate trial to include the witnesses and documents we have requested," he added, referencing newly disclosed emails that showed Duffey, an official at the Office of Management and Budget, told the Pentagon to withhold Ukrainian military aid just hours after Trump's infamous July 25 phone call with Ukrainian President Volodymyr Zelensky.

The House earlier this month voted to impeach Trump on charges of abuse of power and obstruction of Congress. Ahead of the vote, Schumer wrote to Senate Majority Leader Mitch McConnell (R-Ky.) and called for Mulvaney, Bolton, Duffey and Blair to testify as witnesses during a trial.

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But McConnell said that the trial should not include witnesses and has argued that lawmakers have "heard enough" amid the impeachment proceedings. Trump said in mid-December that McConnell could decide on whether there would be witnesses in the upper chamber trial.

Robert Driscoll, a lawyer for Mulvaney, told the Times that the acting chief of staff would consider a request to testify in consultation with the White House.

"I hope every Republican senator should read this story and explain why they would oppose our reasonable request for witnesses and documents in the Senate trial," Schumer said. "This story makes the choice even clearer: Will the Senate hold a fair trial, or will it enable a cover-up?"