Chris Christie has a confession to make: Endorsing Donald Trump in 2016 was a mistake.

In a
new campaign ad released Thursday, Christie talks directly to the camera and admits that he regrets endorsing Trump for president in 2016. Christie has been highly critical of the former president during his own White House bid.

“Eight years ago when I decided to endorse Donald Trump for president, I did it because he was winning, and I did it because I thought I could make him a better candidate and a better president,” Christie said in the ad. “Well, I was wrong, I made a mistake.”