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Former GOP senator urges Republicans to back impeachment witnesses

A former Republican senator is urging members of his party to call for witnesses as part of President TrumpDonald John TrumpJudge rules to not release Russia probe documents over Trump tweets Trump and advisers considering firing FBI director after election: WaPo Obama to campaign for Biden in Florida MORE’s impeachment trial. 

Former Sen. John Warner (Va.) asked Republicans to honor the nation's history of “judicial norms” as the impeachment process continues, largely echoing many Democrats that have been calling for witnesses since the start of the impeachment trial. 

“As a lifelong Republican and a retired member of the U.S. Senate, who once served as a juror in a Presidential impeachment trial, I am mindful of the difficult responsibilities those currently serving now shoulder,” Warner said in a statement, shared by a New York Times reporter Thursday on Twitter. 

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“I believe, as I am sure you do, that not only is the President on trial, but in many ways so is the Senate itself. As such, I am strongly supportive of the efforts of my former Republican senate colleagues who are considering that the Senate accept the introduction of additional evidence that they deem relevant,” he added. 

Warner said that throughout U.S. history, judicial systems have “largely supported the judicial norms of evidence, witnesses and relevant documents.” 

“I respectfully urge the Senate to be guided by the rules of evidence and follow our nation’s judicial norms, precedents and institutions to uphold the constitution and the rule of law by welcoming relevant witnesses and documents as part of this impeachment trial,” he said. 

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A vote on whether or not to allow witnesses will be Friday. Democrats need at least four Republicans to join them to pass the measure. 

Although some GOP senators have signaled they are open to hearing from witnesses, Republicans voiced confidence Tuesday that they will be able to block witnesses. 

Democrats have been pushing to hear from firsthand witnesses of Trump’s decision making with regard to Ukraine. Their push was bolstered after The New York Times reported Sunday that former national security advisor John BoltonJohn BoltonJohn Kelly called Trump 'the most flawed person' he's ever met: report Bolton: North Korea 'more dangerous now' Demand for Trump-related titles sparks expected record year for political books MORE claims in a manuscript of his forthcoming memoir that Trump tied Ukrainian aid to investigations into his political opponent, Joe BidenJoe BidenTrump and advisers considering firing FBI director after election: WaPo Obama to campaign for Biden in Florida Supreme Court reinstates ban on curbside voting in Alabama MORE

Bolton has said he would testify if subpoenaed.