Former White House communications director Anthony ScaramucciAnthony ScaramucciScaramucci: 'Trump fatigue' could help Bloomberg beat Trump if he wins Democratic nomination Will Republicans continue to engage in willful blindness? Scaramucci: Trump sees Bloomberg as threat MORE said late Friday that there is “no question” that Michael BloombergMichael Rubens BloombergTrump slams Bloomberg over comments on man who shot Texas gunman Bloomberg: 'My story might have turned out very differently if I had been black' Sanders, Warren battle for progressive endorsements MORE would be “the No. 1 threat” to President TrumpDonald John TrumpTrump rails against impeachment in speech to Texas farmers Trump administration planning to crack down on 'birth tourism': report George Conway on Trump adding Dershowitz, Starr to legal team: 'Hard to see how either could help' MORE should the former New York City mayor enter the 2020 Democratic presidential primary.

“I think the president would be very intimidated by a guy like Michael Bloomberg,” Scaramucci told CNN’s Chris CuomoChristopher (Chris) Charles CuomoMedia's selective outrage exposed in McSally-Raju kerfuffle Tucker Carlson delivers program's largest audience during Iranian missile strike coverage Judge Judy dismisses Biden: 'Do you see greatness?' MORE. “He’s a New Yorker. He could stand the onslaught of the president’s bullying. He’s worth probably five to eight times the president’s net worth. He could spend a fortune defending himself and getting ads up in all areas of the country.”

“And if Mike Bloomberg got the nomination, it’s very clear to me that he would beat Trump,” Scaramucci added, citing the billionaire businessman's “level of moderation,” “pro-business nature” and “social progressiveness.”

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Bloomberg on Friday officially filed as a candidate for the Alabama Democratic presidential primary, signaling the first step in a possible White House run that could shake up the crowded primary field.

If he enters the race, he would directly face off with former Vice President Joe BidenJoe BidenNYT editorial board endorses Warren, Klobuchar for Democratic nomination for president Trump rails against impeachment in speech to Texas farmers Biden breaks away from 2020 pack in South Carolina MORE and South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegBiden breaks away from 2020 pack in South Carolina Sanders says gender 'still an obstacle' for female politicians Sanders v. Warren is just for insiders MORE, the two leading moderate candidates.

He would also likely become a top target for progressive front-runners Sens. Elizabeth WarrenElizabeth Ann WarrenNYT editorial board endorses Warren, Klobuchar for Democratic nomination for president Trump rails against impeachment in speech to Texas farmers Biden breaks away from 2020 pack in South Carolina MORE (D-Mass.) and Bernie SandersBernie SandersNYT editorial board endorses Warren, Klobuchar for Democratic nomination for president Trump rails against impeachment in speech to Texas farmers Biden breaks away from 2020 pack in South Carolina MORE (I-Vt.), who have slammed the rich for holding too much power in U.S. politics and have insisted that the wealthiest Americans should pay higher taxes.

Amid speculation that Bloomberg would launch a presidential bid, Trump said Friday that he doesn’t think the former mayor would perform well in the primary. Trump added, however, that he’d like to run against Bloomberg, whom he nicknamed “little Michael.”

“Little Michael will fail. He’ll spend a lot of money. He’s got some really big issues, he’s got some personal problems and he’s got a lot of other problems,” Trump said. “He will not do very well and if he did, I would be happy. There’s nobody I’d rather run against than little Michael.”