Frequent Trump critic George ConwayGeorge Thomas ConwayOvernight Defense: Trump to withdraw US from Open Skies Treaty | Pentagon drops ban on recruits who had virus | FBI says Corpus Christi shooting terror-related Former CIA chief: Trump withdrawal from Open Skies Treaty 'is insane' 'Never Trump' Republicans: Fringe, or force to be reckoned with? MORE “fixed” President TrumpDonald John TrumpTrump retweets personal attacks on Clinton, Pelosi, Abrams Biden swipes at Trump: 'Presidency is about a lot more than tweeting from your golf cart' GOP sues California over Newsom's vote-by-mail order 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 ConwayJuan Williams: Anti-Trump Republicans flex their muscle George Conway group targets Tillis's loyalty to Trump in new ad George Conway group launches campaign to gin up GOP and independent support for Biden 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) 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 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.