President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE lashed out at Democrats on Wednesday after a press conference by special counsel 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 accelerated calls for impeachment on Capitol Hill and among Democratic 2020 candidates.

In a tweet, the president accused Democrats, without providing evidence, of committing a "crime" related to Mueller's investigation into Russian interference in the 2016 election. He also blasted the continued congressional investigations into his administration as a "WITCH-HUNT."

"How do you impeach a Republican President for a crime that was committed by the Democrats? WITCH-HUNT!" he wrote.

How do you impeach a Republican President for a crime that was committed by the Democrats? WITCH-HUNT! — Donald J. Trump (@realDonaldTrump) May 30, 2019

Trump has frequently accused top officials at the FBI and the Justice Department under the Obama administration of opening an investigation into his campaign without evidence and basing their probe off of an unverified dossier funded in part by Hillary Clinton Hillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE's campaign.

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Former top figures at both agencies have maintained the investigation into the Trump campaign began after George PapadopoulosGeorge Demetrios PapadopoulosTale of two FBI cases: Clinton got warned, Trump got investigated Trump says he would consider pardons for those implicated in Mueller investigation New FBI document confirms the Trump campaign was investigated without justification MORE, an aide to the campaign, told an Australian diplomat that Russia was in possession of stolen emails from the DNC and Clinton's campaign.

The Justice Department revealed last month that it had assigned a team of prosecutors to look into the issue, as well as the FBI's general conduct related to the investigation.

“I am reviewing the conduct of the investigation and trying to get my arms around all the aspects of the counterintelligence investigation that was conducted during the summer of 2016,” Attorney General William Barr Bill BarrHarris faces pivotal moment with Supreme Court battle Hillicon Valley: DOJ proposes tech liability shield reform to Congress | Treasury sanctions individuals, groups tied to Russian malign influence activities | House Republican introduces bill to set standards for self-driving cars McCarthy threatens motion to oust Pelosi if she moves forward with impeachment MORE told a House subcommittee in April.