Scott Pruitt stepped down as head of the Environmental Protection Agency, after a series of controversies that overshadowed his year of leading President Trump’s anti-regulation, pro-growth agenda.

“I have accepted the resignation of Scott Pruitt as the Administrator of the Environmental Protection Agency,” Trump tweeted Thursday. “Within the Agency Scott has done an outstanding job, and I will always be thankful to him for this. The Senate confirmed Deputy at EPA, Andrew Wheeler, will on Monday assume duties as the acting Administrator of the EPA. I have no doubt that Andy will continue on with our great and lasting EPA agenda. We have made tremendous progress and the future of the EPA is very bright!”