CNN’s Fareed Zakaria Sunday called out Republican Sen. John McCain on Sunday for backing Donald Trump, suggesting the senator’s “honor” is at stake if he does not recant.

“McCain has lived a life of service, with acts of courage that are beyond my comprehension,” Zakaria said on the show he hosts called GPS. “When the North Vietnamese offered to release him in advance of other prisoners of war, because his father was an admiral, he refused, preferring more captivity and torture to losing his honor. Years later, when he learned that Henry Kissinger had also refused to allow any special treatment for him, he thanked Kissinger ‘for saving my reputation, my honor, my life, really.'”