President Obama forcefully condemned Donald Trump on Sunday for “helping” Islamic State militants by dividing Americans with his rhetoric on terrorism.

“Look, if we start engaging in the kinds of proposals that we’ve heard from Mr. Trump or some of his surrogates like Mr. Gingrich, where we start suggesting that we would apply religious tests to who could come in here, that we are screening Muslim Americans differently than we would others, then we are betraying that very thing that makes America exceptional,” Obama told CBS’ John Dickerson in a pre-taped interview.