On Friday, at a press briefing after being named White House communications director, Scaramucci apologized.
"I should have never said that about him," Scaramucci said.
Scaramucci, whose appointment Friday was followed by the resignation of press secretary Sean Spicer, called the remarks about Trump "one of the biggest mistakes" he's made. He blamed it on his lack of political experience and support for another candidate.
Trump brings it up to him "every 15 seconds," Scaramucci joked. He added: "Mr. President, if you're listening, I personally apologize for the 50th time for saying that."
Scaramucci, who made his name in the hedge fund industry, made the original comments on Fox Business in August 2015 after Trump criticized "hedge fund guys paying nothing" in taxes.
"He's got a big mouth," Scaramucci said at the time. "You're an inherited money dude from Queens County. Bring it, Donald."