Donald Trump
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LYNDEN, WA - MAY 07: Republican presidential candidate Donald Trump gives a speech during a rally at the The Northwest Washington Fair and Event Center on May 7, 2016 in Lynden, Washington. Trump became the Republican presumptive nominee following his landslide win in Indiana on Tuesday. (Photo by Matt Mills McKnight/Getty Images)
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Washington CNN —  

Donald Trump says even if he becomes president, he doesn’t expect to halt all mass shootings like the massacre at an Oregon community college Thursday because there will always be people that society can’t stop.

Trump on Friday was asked what he would do as president to try to prevent attacks like the shooting at Umpqua Community College, but he said there are “millions and millions of sick people all over the world” that make it difficult, no matter how strong the laws are.

“You’re going to have these things happen and it’s a horrible thing to behold, horrible,” Trump said on MSNBC’s “Morning Joe.”

“It’s not politically correct to say that, but you’re going to have difficulty and that will be for the next million years, there’s going to be difficulty and people are going to slip through the cracks,” Trump added. “What are you going to do, institutionalize everybody?”

Obama: ‘Somehow this has become routine’

The Republican front-runner said that he expects as information about the shooting comes out, it’ll be clear that the attacker was a “loner” like so many other shooters, and that people he knew always thought something was off about him.

But, Trump said, “It’s awfully hard to put somebody in an institution for the rest of their lives based on the fact that he looks like he could be a problem.”

Opinion: Why we’re still debating guns in 2015