Trump rips Democrats ahead of testimony from 'sleazebag' Watergate lawyer

President TrumpDonald John TrumpDavid Axelrod after Ginsburg cancer treatment: Supreme Court vacancy could 'tear this country apart' EU says it will 'respond in kind' if US slaps tariffs on France Ginsburg again leaves Supreme Court with an uncertain future MORE on Sunday ripped Democrats ahead of testimony from John Dean, a former White House counsel for President Nixon who proved pivotal during the Watergate scandal.

"The Dems were devastated — after all this time and money spent ($40,000,000), the Mueller Report was a disaster for them," Trump tweeted Sunday evening.

"But they want a Redo, or Do Over. They are even bringing in @CNN sleazebag attorney John Dean. Sorry, no Do Overs — Go back to work!"

Dean, a CNN contributor, was connected to the Watergate cover-up and delivered televised testimony before lawmakers that helped lead to Nixon’s resignation.

Democrats in the House Judiciary Committee will grill Dean on Monday in an attempt to shine a spotlight on the unsavory details about Trump’s conduct contained in special counsel Robert MuellerRobert (Bob) Swan MuellerMueller report fades from political conversation Trump calls for probe of Obama book deal Democrats express private disappointment with Mueller testimony MORE’s report.

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Dean has been a vocal critic of Trump's, arguing the president engaged in obstruction based on what is described in Mueller’s report.

Mueller's team did not make a judgement on obstruction of justice, instead listing 10 potential cases of it.

Many Democrats have argued Mueller found substantial evidence that Trump obstructed justice and have taken the special counsel's public statements on May 29 as a green light to further investigate the president’s conduct.

Democrats have said they hope Dean will be able to provide firsthand expertise on obstruction of justice and to compare Trump's conduct with Nixon's.

Trump has frequently painted Democrats as trying to defame him ahead of the 2020 presidential election, saying that Mueller's report made it clear that there was "no collusion, no obstruction."