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."

Trump suggested some refugees entering the country are already being financed by the Islamic State.

"I mean you look at it, they have cell phones," Trump said. "So they don't have money, they don't have anything. They have cell phones. Who pays their monthly charges, right? They have cell phones with the flags, the ISIS flags on them. And then we're supposed to say, 'Isn't this wonderful that we're taking them in?' We're led by people that are either incompetent or they don't have the best interests of our country at heart."

Trump charged that Hillary Clinton wants potentially dangerous refugees to "pour into the country," asserting, "She wants to have a very weak border."