Frequent Trump critic George ConwayGeorge Thomas ConwayLawmakers, social media users praise photo of Pelosi confronting Trump George Conway accuses Trump of being a 'sociopath' George Conway donates to Trump challenger Joe Walsh MORE “fixed” President TrumpDonald John TrumpFlorida GOP lawmaker says he's 'thinking' about impeachment Democrats introduce 'THUG Act' to block funding for G-7 at Trump resort Kurdish group PKK pens open letter rebuking Trump's comparison to ISIS MORE’s tweet attacking Democrats on Wednesday morning, calling Trump the “most unfit and incompetent president in American history.”

Conway, whose critiques of Trump have made him a social media star given his marriage to White House counselor Kellyanne ConwayKellyanne Elizabeth ConwayThe Hill's Campaign Report: Biden camp faces new challenges Trump offers condolences on frequent foe Cummings: 'Very hard, if not impossible, to replace' Lawmakers, social media users praise photo of Pelosi confronting Trump MORE, tweaked the language on the president’s tweet predicting that his approval numbers in polls would be 65 percent if not for the “illegal witch hunt” Russia investigation.

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“.@realDonaldTrump—fixed this for you,” Conway wrote. “Without your bizarre, improper, impeachable, and ILLEGAL behavior in response to the perfectly justified investigation you like to call a 'Witch Hunt,' and without your deranged behavior in numerous other respects, your poll numbers, especially because of the great, full-employment economy that you inherited and then goosed up with massive deficit spending, would be much higher than they are.”

“Too bad!  The most unfit and incompetent president in American history,” Conway concluded.

Trump slammed Democrats in a series of early morning tweets for investigations into his administration, campaign and businesses amid talk of impeachment. 

"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.

His remarks come as Democrats have pressed for special counsel Robert MuellerRobert (Bob) Swan MuellerFox News legal analyst says Trump call with Ukraine leader could be 'more serious' than what Mueller 'dragged up' Lewandowski says Mueller report was 'very clear' in proving 'there was no obstruction,' despite having 'never' read it Fox's Cavuto roasts Trump over criticism of network MORE to testify before Congress following his investigation and report into Russian interference in the 2016 election.

Democrats hope to grill Mueller on whether he believes Trump obstructed justice after writing in his report that he could not make that determination.