White House communications director Anthony Scaramucci speaks to members of the media outside the White House in Washington, Tuesday. Scaramucci increased tensions with his comments Thursday.

WASHINGTON — President Donald Trump’s new communications director exploded the smoldering tensions at the White House into a full-fledged conflagration Thursday, angrily daring Trump’s chief of staff to deny he’s a “leaker” and exposing West Wing backstabbing in language more suitable to a mobster movie than a seat of presidential stability.

In a pull-no-punches, impromptu CNN interview that he said was authorized by the president, Anthony Scaramucci went after chief of staff Reince Priebus in graphic terms. “The fish stinks from the head down,” he said. “I can tell you two fish that don’t stink, and that’s me and the president.”

Not even a week into his new job, Scaramucci accused unidentified senior officials of trying to sabotage him and committing a felony by leaking information. But the personal financial information that he said someone had “leaked” about him had simply been obtained through a public records request.

Then in an interview published by The New Yorker late Thursday, an angry Scaramucci used an expletive to accuse Priebus of being a “f------ paranoid schizophrenic” and White House chief strategist Steve Bannon of trying to burnish his own reputation.

He also threatened to fire White House staffers who leaked about a dinner he had with the president.

“They’ll all be fired by me,” Scaramucci told the magazine. “I fired one guy the other day. I have three to four people I’ll fire tomorrow. I’ll get to the person who leaked that to you. Reince Priebus — if you want to leak something — he’ll be asked to resign very shortly.”

By day’s end Scaramucci sounded calmer, though not regretful.

“I sometimes use colorful language. I will refrain in this arena but not give up the passionate fight for @realDonaldTrump’s agenda. #MAGA,” he tweeted. The tag at the end stands for Trump’s “Make America Great Again.”

He also blamed the reporter, Ryan Lizza. “I made a mistake in trusting in a reporter,” he added later. “It won’t happen again.”

White House spokeswoman Sarah Huckabee Sanders referred reporters to the first tweet.

The president’s senior counselor, Kellyanne Conway, had earlier speculated in a Fox News interview that unnamed forces were out to get Scaramucci, saying: “Somebody is trying to get in his way and scare him off.”

Meanwhile, no one in the White House took up for Priebus — including Priebus himself. Sanders avoided giving a direct answer when asked whether Trump has confidence in Priebus.