Donald Trump is starting to gain a reputation as one who cannot let go of some issues from his pre-presidential life.
At Thursday's National Prayer Breakfast in Washington DC, Mr Trump asked leaders to pray for Arnold Schwarzenegger - the boss inThe New Celebrity Apprentice; Mr Trump's old TV show.
Ratings are low for the new Apprentice, and the US President has made many mocking comments since it started at the beginning of January.
"We had tremendous success with The Apprentice," Mr Trump told the assembled religious and political leaders. "When I ran for President I had to leave the show."
"They hired a big, big movie star - Arnold Schwarzenegger - to take my place, and we know how that turned out. The ratings are right through the tubes. It's been a total disaster... And I want to just pray pray for Arnold - for those ratings if we can," the Commander-in-Chief said.
The Terminator soon replied in a Facebook video saying: "Hi Donald, I have a great idea - why don’t we swap jobs? You take over TV because you're such an expert on ratings, and I take over your job, so that people can finally sleep comfortably."
A spokesperson for Schwarzenegger said: "Arnold is praying that President Trump can start improving his own approval ratings, which were the worst in history for an incoming President, by taking his job seriously and working inclusively."
One of the first tiffs between the two came a week after the new Apprentice premiere in January, when Mr Trump tweeted: "Wow, the ratings are in and Arnold Schwarzenegger got "swamped" (or destroyed) by comparison to the ratings machine."
Schwarzenegger tweeted back: "There's nothing more important than the people's work, @realDonaldTrump. I wish you the best of luck and I hope you'll work for ALL of the American people as aggressively as you worked for your ratings. [sic]"
The National Prayer Breakfast was established by President Dwight Eisenhower in 1953. It was created for political, business and faith leaders to meet and build relationships. This year's keynote speaker was Californian megachurch pastor Rick Warren.
On Facebook Mr Warren said he planned to talk about peace. "Everybody wants to have peace, but who wants to make peace?" he said.
Christians are meant to bring people of opposite sides together, Mr Warren said.
Previous keynote speakers include U2's Bono, Mother Teresa, and Tony Blair.
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