An adviser to Donald Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE resigned on Monday after taking to Twitter to celebrate news that campaign manager Corey Lewandowski had left the campaign.

Michael Caputo, who worked in the Trump campaign’s communications department, tweeted this morning that “the witch is dead” after news broke that the Trump campaign and Lewandowski had parted ways.

https://twitter.com/MichaelRCaputo/status/744889850914971648

In a letter obtained by CNN, Caputo said he informed the campaign he would resign because he had become a distraction.

"I regret sending out a tweet today alluding to the firing of Corey Lewandowski,” Caputo wrote in a letter to campaign chairman Paul Manafort.

“In hindsight, that was too exuberant a reaction to this personnel move,” he continued. “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 told the campaign to call him if he can help going forward.

"I wish you success in the months ahead,” he said. “I continue to believe Donald Trump must be elected president in November. With you at the helm, I know he can. Call if I can help."