Donald Trump’s campaign manager, Corey Lewandowski, is leaving the campaign, after a turbulent couple of weeks in which Hillary Clinton has established a lead in an average of polls.

Hope Hicks, spokeswoman for the campaign, said in a statement that “The Donald J. Trump Campaign for President, which has set a historic record in the Republican Primary having received almost 14 million votes, has today announced that Corey Lewandowski will no longer be working with the campaign.”

“The campaign is grateful to Corey for his hard work and dedication and we wish him the best in the future,” she said.

As he assembles a team for the general election, Trump is facing questions of whether he will have the staff and resources to compete in November. The New York Times, citing unnamed sources, said that the departure had been in the works for many weeks and there was desire to make a change before the Republican National Convention on July 18-21.

In April, prosecutors in Palm Beach County, Fla., declined to press battery charges against Lewandowski after a reporter for Breitbart News, Michelle Fields, accused him of pulling her down as she sought to ask Trump a question following a press conference. Trump defended Lewandowski, and he denied the charges. Prosecutors said that Lewandowski had a “reasonable hypothesis of innocence.”

On CNN’s “Wolf” on Monday, Lewandowski was asked why he was fired and he responded, “I don’t know. I don’t know the answer to that.”

“I had a nice conversation with Mr. Trump and I said to him it’s been an honor and a privilege to be part of this,” he said. “And I mean that from the bottom of my heart.  I think as you look at how small this team has been and how close-knit this team has been, it’s really important to know that there are highs and lows in every campaign and we’ve been through them together.”