The former London mayor was one of the most prominent advocates for the U.K. leaving the European Union. In the wake of last week's referendum, current Prime Minister David Cameron, a staunch opponent of the effort, announced his resignation. Saying that the country deserves a leader who supports the movement, Cameron left the door wide open for Johnson.
Some people expressed their shock and dismay at Johnson's decision to leave the race for leader of the country he shepherded into unprecedented and vulnerable territory.
But all's not lost for Boris. He's got a regular column in the Telegraph and, if all else fails, a bright future as Donald Trump's body double.