President Donald Trump on Wednesday went off on the chorus of Democrats calling to begin impeachment proceedings against him, claiming they want a "DO OVER" of special counsel Robert Mueller's investigation.

"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," Trump said in a series of Twitter posts. "Now they say Impeach President Trump, even though he did nothing 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," he added in another tweet. "In other words, the Witch Hunt continues!"

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

Congressional Democrats have ramped up calls for impeachment proceedings in light of the Trump administration's defying a series of subpoenas for documents and testimony, or insisting they will do so. The latest such incident involved former White House Counsel Don McGahn, whom the White House instructed not to show up to a House Judiciary Committee hearing on Tuesday.

House Speaker Nancy Pelosi is not yet in favor of impeachment. Several Democrats pressed her Monday evening during a leadership meeting on Capitol Hill to move forth with an impeachment inquiry against Trump if McGahn did not show up.

"There's a growing understanding that the impeachment process is inevitable — when, not if," House Budget Committee Chairman John Yarmuth, D-Ky., told reporters.

Trump's tweets also came after a federal judge on Monday ruled in favor of the House Oversight Committee's bid to obtain his financial records from his accounting firm, and after Rep. Justin Amash, R-Mich., over the weekend became the first Republican to say Mueller's report showed Trump engaged in "impeachable" conduct.

Trump has at times claimed that the Mueller report exonerates him while at other times lamenting it as biased. In his 400-plus page report, Mueller wrote he was unable to establish a Trump-Russia conspiracy although his investigation "established multiple links between Trump Campaign officials and individuals tied to the Russian government."

Trump added another claim on Twitter Wednesday morning, saying: "Without the ILLEGAL Witch Hunt, my poll numbers, especially because of our historically 'great' economy, would be at 65%. Too bad!"