Anthony ScaramucciAnthony ScaramucciScaramucci: Trump sees Bloomberg as threat Scaramucci: Trump will be gone by March 2020 Scaramucci hits back after Bullock solicited personal message of praise MORE, a former aide to President TrumpDonald John TrumpTrump opens new line of impeachment attack for Democrats Bloomberg to spend 0M on anti-Trump ads in battleground states New witness claims first-hand account of Trump's push for Ukraine probes 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: Trump tweets on Yovanovitch show his 'insecurity as an imposter' On The Money: Trump asks Supreme Court to block Dem subpoena for financial records | Kudlow 'very optimistic' for new NAFTA deal | House passes Ex-Im Bank bill opposed by Trump, McConnell Overnight Defense: Ex-Ukraine ambassador offers dramatic day of testimony | Talks of 'crisis' at State Department | Trump tweets criticism of envoy during hearing | Dems warn against 'witness intimidation' | Trump defends his 'freedom of speech' 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 BidenBloomberg to spend 0M on anti-Trump ads in battleground states New witness claims first-hand account of Trump's push for Ukraine probes Obama cautions 2020 hopefuls against going too far left 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.