Arnold Schwarzenegger ripped Donald Trump in a video response Thursday morning after the president offered a prayer at the National Prayer Breakfast to save the former governor’s ratings as the new host of “The Celebrity Apprentice.” Mr. Trump, who was introduced at Thursday’s breakfast by “The Apprentice” franchise creator Mark Burnett, took a shot at Mr. Schwarzenegger’s ratings since taking over the show, which the president hosted from 2004 to 2015.