UNITED NEWS INTERNATIONAL (UNI) — Scott Pruitt, the embattled head of the U.S. Environmental Protection Agency, has resigned.

In a tweet on Thursday, July 5,  President Donald Trump confirmed Pruitt’s departure, saying that he had accepted the EPA administrator’s resignation.

In a letter to the President, Pruitt thanked Trump for the opportunity to head the agency. However, he wrote that “the unrelenting attacks on me personally, my family, are unprecedented and have taken a sizable toll on all of us.”

His resignation, effective Friday, follows months of high-profile controversies regarding his spending, ethics and management at the agency.

Pruitt’s tumultuous tenure spawned more than a dozen investigations into his travel and robust security team.

He also faced reports that he maintained a secret, internal calendar that he directed aides to change from the public version they released.

Pruitt will be replaced on Monday by EPA Deputy Administrator Andrew Wheeler.