Arnold Schwarzenegger has been a friend of President Trump’s for decades, but on Wednesday he admitted the reason he did not vote for the Republican candidate last November was because of Trump’s stance on coal.

“The reason why I didn’t want to vote for him is simply because just along the issue that he wanted to bring coal back. I say to myself ‘I’ve been fighting for clean environment since the time I’ve come into the governorship,'” Schwarzenegger told CNN host Van Jones at a town hall on Wednesday evening.