Sen. Kamala Harris Kamala HarrisPelosi: Trump Supreme Court pick 'threatens' Affordable Care Act What Kamala Harris' VP nomination means to us Harris slams Trump's Supreme Court pick as an attempt to 'destroy the Affordable Care Act' MORE (D-Calif.) pushed for impeachment testimony from 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 and 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 in a Wednesday New York Times op-ed.

Harris accused 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 (R-Ky.) of attempting to cover up for 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 by refusing to allow witnesses to the Ukraine controversy to testify in front of the Senate. She wrote that he wants a “Senate cover-up” instead of a Senate trial.

“He is already trying to limit the impeachment trial by preventing witnesses from testifying, and he has all but announced a verdict,” she said. “In doing so, he showed the American people that he has no intention of honoring his oath.”

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The former presidential candidate backed 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’s (D-N.Y.) proposal to hear from four new witnesses, including Mulvaney and Bolton, and said there should not be a vote on impeachment until the Senate has all of the applicable testimony and documents.

“I have never been in a courtroom where the accused can unilaterally block witnesses from testifying or prohibit prosecutors from asking witnesses questions,” she wrote. “No court would allow a trial to proceed this way, and neither should any member of the Senate.”

The California senator also knocked McConnell for “unilaterally blocking” the Voting Rights Act, prescription drug laws and gun violence legislation, saying that he will not have “the power to unilaterally undermine this trial.”

The House is expected to vote Wednesday to move the impeachment matter to the Senate for a trial. The Republican-controlled Senate is unlikely to remove Trump from office.

McConnell rejected Schumer’s call for the four witnesses on the Senate floor Tuesday and has said the trial should not have any witnesses. He has also said he will not handle the trial as an impartial juror.

Trump is accused of abuse of power and obstructing Congress after an impeachment inquiry was sparked by his ask to the Ukrainian president to investigate former Vice President Joe Biden Joe BidenBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Joe Biden should enact critical government reforms if he wins MORE and his son.