In an interview broadcast Sunday, Donald Trump said refugees coming into the country now will launch major attacks on the United States.

“Bad things will happen — a lot of bad things will happen. There will be attacks that you wouldn’t believe,” Trump said on the National Border Patrol Council’s “Green Line” radio show, as first reported by Buzzfeed. “There will be attacks by the people that are right now coming into our country, because, I have no doubt in my mind.”