Anthony ScaramucciAnthony ScaramucciFormer DeVos chief of staff joins anti-Trump group Scaramucci to Lemon: Trump 'doubling down' on downplaying virus 'should scare' viewers Sunday shows - Leaked audio of Trump's sister reverberates MORE, a former aide to President TrumpDonald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE who is now a high-profile critic, predicted Tuesday is it only a matter of time now before his former boss leaves office.

“He is gone. It’s only a matter of time now and negotiation. @realDonaldTrump is done,” Scaramucci, who for less than two weeks served as Trump's communications director at the White House, wrote in a tweet.  

The tweet came a short time after reports circulated that Speaker Nancy PelosiNancy PelosiPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Trump signs largely symbolic pre-existing conditions order amid lawsuit MORE (D-Calif.) is set to launch a formal impeachment inquiry against the president after rejecting such an effort for months. 

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Calls from Democrats to impeach Trump snowballed on Tuesday over allegations that Trump withheld military aid to Ukraine while pressuring that country's leader to investigate former Vice President Joe BidenJoe BidenPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Fox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio MORE and his son Hunter Biden.

Trump has denied any quid pro quo but offered to release a transcript of his call with Ukraine's president. Democrats want to see a whistleblower's complaint that was filed by someone within the administration after the July 25 call.

Scaramucci has been an outspoken critic of Trump for months. Last month, he announced in an interview that he was putting together “a team of people,” including former Cabinet members, to oppose Trump, calling him “unstable.”

Earlier in August he alleged that “eventually [Trump] turns on everyone and soon it will be you and then the entire country,” responding to a tweet from the president calling him “totally incapable of handling” his position at the White House.