“He’s off the rails,” Mr. Scaramucci said in an interview on Monday. “And the honest people in the room know that he is crazy.”…

In an interview, Mr. Scaramucci did not say who in the Republican Party he believed should step in, but “those closest are the most concerned” about Mr. Trump’s behavior.

“The behavior is nihilistic,” Mr. Scaramucci said. “If it continues, responsible people will have to speak up.”

But on Monday, two former White House officials disputed the idea that people around the president were concerned that his recent comments had crossed the line. One of them called Mr. Scaramucci’s criticism “hypocritical.” Another said aides were so desensitized to criticism that the backlash to the president’s trip last week was not going to faze them.