Article continues below advertisementJimmy Kimmel branded Donald Trump a "petty little b----" after the president celebrated the death of former FBI director Robert Mueller last week. Reacting to the news on Saturday, March 21, Trump, 79, wrote in a Truth Social post: "Robert Mueller just died. Good. I'm glad he's dead. He can no longer hurt innocent people.""Meaning him," the comedian, 58, quipped during Jimmy Kimmel Live! on Monday, March 23, alluding to the investigation overseen by Mueller into Russian interference in the 2016 election.