President Donald Trump took to Twitter on Saturday to criticize former California governor and Apprentice host Arnold Schwarzenegger.

Trump, who once hosted the reality TV show himself, said that Schwarzenegger quit the show because of abysmal ratings.

“Arnold Schwarzenegger isn’t voluntarily leaving the Apprentice, he was fired by his bad (pathetic) ratings, not by me. Sad end to great show,” Trump tweeted.

Schwaarzenegger tweeted in response: “You should think about hiring a new joke writer and a fact checker.”

Schwarzenegger announced on Friday that he would leave the NBC reality TV show.

Trump, who remains the show’s executive producer, and Schwarzenegger, are both Republicans.

However, Schwarzenegger, a former body-builder and action-movie star, did not support Trump’s candidacy. He also suggested that The Apprentice’s low ratings were due to Trump’s “baggage”

Trump also criticized Schwarzenegger during his address last month at the National Prayer Breakfast, suggesting Americans pray for Schwarzenegger because of the show’s low ratings.