Nine weeks ago, Anthony Scaramucci was still the communications director to the president, flying on Air Force One and steering the public relations strategy of the White House.

On Monday evening, he was a man with his arm in a sling, explaining how the moon landing led to the invention of Tang and Velcro (it didn’t) to reporters in the mirrored basement of a Midtown Manhattan steakhouse that he partially owns.

The arc of Mr. Scaramucci’s career is long and strange, and lately it has bent toward ignominy. After being fired by President Trump, sued for divorce and turned into a late-night piñata for his foul-mouthed speaking habits, Mr. Scaramucci is trying to mount a comeback with a media venture he is calling The Scaramucci Post.

So far, the project’s contours are vague. “It’s going to start out experiential on the net,” Mr. Scaramucci, an American flag pinned to his lapel, said during a launch party at the Hunt & Fish Club on West 44th Street.