Donald Trump has hired experienced Republican operative Jason Miller to serve as a senior communications adviser on his presidential campaign, marking the latest significant personnel move the mogul has made to beef up his organization for the general election.

He is also adding former RNC communications aide Michael Abboud as communications coordinator as be builds out his media operation. In a written statement provided to The Washington Post, Trump said: “As we continue to work to defeat Hillary Clinton this November, I am constantly building a superior political team. After winning the most votes in the history of a Republican primary contest, we are taking our messages to the people so that we can Make American Great Again.”

Miller's hiring comes the week after Corey Lewandowski was fired as Trump's campaign manager. He most recently worked on the presidential campaign of Sen. Ted Cruz (R-Tex.). He is a veteran of Capitol Hill and Republican congressional campaigns.

Alan Cobb, who has been a senior adviser to Trump, will serve as the director of coalitions, the campaign said. In that role, he will help organize and manage groups backing Trump, the campaign said.

Abboud will work on the campaign's rapid response and messaging.

Miller did not immediately comment. When Miller worked for Cruz, he was, like his then-boss, critical of Trump. The liberal group Think Progress published cached versions of some anti-Trump tweets deleted from Miller's Twitter account.