Given all of that, Mr. Johnson’s Friday-night exit could be seen as a way for him to shape the narrative before the report from Parliament’s Privileges Committee comes out. He lashed out at the panel, saying that it had “not produced a shred of evidence that I knowingly or recklessly misled the Commons.”

“Their purpose from the beginning has been to find me guilty, regardless of the facts,” Mr. Johnson wrote. “This is the very definition of a kangaroo court.”

In its bitterness and sense of grievance, Mr. Johnson’s response drew parallels to that of former President Donald J. Trump, a politician to whom he is often compared, and who is now facing the repercussions of his own scandals. It was not lost on political commentators in London that Mr. Johnson’s exit from Parliament came less than 24 hours after federal prosecutors in Washington indicted Mr. Trump on charges of obstructing justice in his handling of classified documents.

But the parallel, analysts say, has its limits. Though Mr. Trump’s legal problems are arguably far greater than Mr. Johnson’s, he remains the front-runner for the 2024 Republican presidential nomination. Mr. Johnson, for all the headlines that he commands, has no comparable base of political support.

“Boris Johnson and Donald Trump both have this psychological need to soak up all the oxygen in the room,” said Jonathan Powell, who served as chief of staff to Prime Minister Tony Blair. “The problem for Boris Johnson is that he’s not getting the same resonance as Trump is with voters.”