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 slammed Democrats on Wednesday for investigations into his administration and talk of impeachment, accusing the party of ignoring its legislative duties to harass him.

In several messages posted early Wednesday morning, the president wrote that congressional Democrats led by Speaker Nancy Pelosi Nancy PelosiHoyer: House should vote on COVID-19 aid — with or without a bipartisan deal Ruth Bader Ginsburg lies in repose at Supreme Court McCarthy threatens motion to oust Pelosi if she moves forward with impeachment MORE (Calif.) were fishing after the years-long special counsel investigation ended without further charges for members of Trump's inner circle.

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"Everything the Democrats are asking me for is based on an illegally started investigation that failed for them, especially when the Mueller Report came back with a NO COLLUSION finding," he wrote. "Now they say Impeach President Trump, even though he did nothin wrong, while they 'fish!' "

"After two years of an expensive and comprehensive Witch Hunt, the Democrats don’t like the result and they want a DO OVER. In other words, the Witch Hunt continues!" Trump added.

Everything the Democrats are asking me for is based on an illegally started investigation that failed for them, especially when the Mueller Report came back with a NO COLLUSION finding. Now they say Impeach President Trump, even though he did nothin wrong, while they “fish!” — Donald J. Trump (@realDonaldTrump) May 22, 2019

After two years of an expensive and comprehensive Witch Hunt, the Democrats don’t like the result and they want a DO OVER. In other words, the Witch Hunt continues! — Donald J. Trump (@realDonaldTrump) May 22, 2019

His remarks come as Democrats have pressed for 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 to testify before Congress on whether he believes Trump obstructed justice, a crime for which Mueller did not make a determination.

Trump in subsequent tweets on Wednesday accused the party of "presidential harassment" and predicted that he would have approval ratings close to 65 percent were it not for the Mueller investigation.

Without the ILLEGAL Witch Hunt, my poll numbers, especially because of our historically “great” economy, would be at 65%. Too bad! The greatest Hoax in American History. — Donald J. Trump (@realDonaldTrump) May 22, 2019

PRESIDENTIAL HARASSMENT! — Donald J. Trump (@realDonaldTrump) May 22, 2019

The president's latest ire toward congressional Democrats comes as more members of the party come forward in support of opening impeachment hearings against Trump, a move that days ago earned its first GOP supporter in Rep. Justin Amash Justin AmashInternal Democratic poll shows tight race in contest to replace Amash Centrist Democrats 'strongly considering' discharge petition on GOP PPP bill On The Trail: How Nancy Pelosi could improbably become president MORE (Mich.).

Democrats have threatened impeachment hearings for months, and the calls have only grown stronger amid resistance from the White House over turning over information Democrats have requested as part of their investigations, including information related to the Russia investigation as well as the president's tax returns.

The pressure to begin impeachment hearings has yet to win support from House Democratic leadership, though Democrats have become more vocal in demanding action from Pelosi and others.

— This report was updated at 7:26 a.m.