GOP presidential front-runner Donald Trump's call to ban all Muslims from entering the United States would make it impossible to work with Arab allies in fighting the Islamic State (ISIS), former Florida Gov. Jeb Bush said in Tuesday's debate.
"The Kurds are our strongest allies. They're Muslim," Bush said.
Trump's plan is "not a serious proposal," said Bush, who earlier described Trump as "unhinged."
"Donald, you know, is great at the one liners, but he's a chaos candidate. And he'd be a chaos president," Bush said.
"Jeb doesn't really believe I'm unhinged," Trump responded. "He said that very simply because he has failed in this campaign. It's been a total disaster. Nobody cares. And, frankly, I'm the most solid person up here."