Michael Caputo, an adviser to Donald Trump and the head of communications for Trump's caucus operations team, resigned on Monday after sending a celebratory tweet about the firing of campaign manager Corey Lewandowski. "Ding dong the witch is dead!" Caputo tweeted shortly after Lewandowski was fired. "I regret sending out a tweet today alluding to the firing of Corey Lewandowski. In hindsight, that was too exuberant a reaction to this personnel move. I know this is a distraction from the kind of campaign you want to run, so I'm resigning my position as director of communications for caucus operations at the 2016 Republican Convention. Let's make this immediate," Caputo wrote in a letter to campaign chairman Paul Manafort.