Elon Musk said Thursday he will leave his positions on three presidential councils. Musk’s decision follows an announcement from President Donald Trump that the U.S. will back out of the Paris climate accord, according to CNBC.

Leaving the agreement is “not good for America or for the world,” the Tesla and Space X CEO said in a tweet.

Musk had served on councils advising Trump on business, manufacturing jobs and infrastructure. He had defended his decision to serve the president, despite criticism. However, on Wednesday Musk warned he might quit if Trump withdrew from the Paris Agreement.

The landmark climate deal calls for the U.S. to reduce its greenhouse gas emissions by between 26 and 28 percent below 2005 levels by 2025, among other things.

Trump has said the Paris accord was negotiated to have terms that are unrealistic and unfair to the U.S.

The president is looking to withdraw from the accord and immediately restart talks to set targets that would be more fair. However, French, German and Italian officials said they do not believe the agreement can be renegotiated.