President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE on Monday renewed his attacks on Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE, days before the former special counsel is set to testify about the Russia investigation during a highly anticipated congressional hearing.

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In a pair of tweets, Trump repeated his claim that Mueller is “highly conflicted” and accused him of leading a “ridiculous Witch Hunt.” The president for more than two years has leveled both charges in an attempt to undermine Mueller’s credibility.

“Highly conflicted Robert Mueller should not be given another bite at the apple. In the end it will be bad for him and the phony Democrats in Congress who have done nothing but waste time on this ridiculous Witch Hunt,” Trump tweeted.

Highly conflicted Robert Mueller should not be given another bite at the apple. In the end it will be bad for him and the phony Democrats in Congress who have done nothing but waste time on this ridiculous Witch Hunt. Result of the Mueller Report, NO COLLUSION, NO OBSTRUCTION!... — Donald J. Trump (@realDonaldTrump) July 22, 2019

....But the questions should be asked, why were all of Clinton’s people given immunity, and why were the text messages of Peter S and his lover, Lisa Page, deleted and destroyed right after they left Mueller, and after we requested them(this is Illegal)? — Donald J. Trump (@realDonaldTrump) July 22, 2019

The president also repeated his belief that Mueller’s report found “NO COLLUSION, NO OBSTRUCTION!”

Mueller on Wednesday is scheduled to testify before the House Judiciary and Intelligence committees, marking the first time he will answer questions about the probe into Russia’s interference in the 2016 election and possible obstruction by Trump.

His appearance on Capitol Hill will create a televised spectacle, with cable and broadcast networks preparing special coverage of the hearings. It could also breathe new life into the debate among congressional Democrats whether to impeach Trump.

Trump has responded by attempting to deflect questions about his own actions, saying Monday that Mueller should be asked about alleged wrongdoing by 2016 Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonFox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio Trump, Biden court Black business owners in final election sprint The power of incumbency: How Trump is using the Oval Office to win reelection MORE and former FBI officials Peter Strzok and Lisa Page.

Mueller is expected to face questions about his decision not to recommend obstruction charges against Trump. During his first public comments on the investigation, Mueller said he could not clear Trump on obstruction of justice and suggested the decision was in part due to Justice Department guidelines stating that a sitting president cannot be indicted.