Donald Trump
Green Party presidential nominee Jill Stein waits to be introduced prior to a press conference at the National Press Club August 23, 2016 in Washington, DC.
Now playing
Jill Stein raises millions for recount
Jill Stein electoin recount intv_00000000.jpg
Now playing
Scientists urge Clinton to call for recount
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)
Now playing
Donald Trump's wild ride
Now playing
Trump's challenges in the Middle East
donald trump undocumented immigrants crime fact check origwx ty_00013807.jpg
Now playing
Fact checking Trump on crimes by immigrants
Now playing
Trump vs. the tape on Obama and the protester
Now playing
Trump compares Clinton email probe to Watergate
Members of the Secret Service rush Republican presidential candidate Donald Trump off the stage at a campaign rally in Reno, Nev., on Saturday, Nov. 5, 2016. (AP Photo/John Locher)
Now playing
Donald Trump rushed off stage by Secret Service
Now playing
Trump reads letter from Patriot's coach at rally
donald trump bill belichick letter read rally new hampshire_00021230.jpg
Now playing
Trump on US officials: 'What a group of losers'
donald trump nice and cool pensacola fl bts_00001523.jpg
Now playing
Trump's mantra in campaign's final week: Stay on point
donald trump nice to hillary clinton and democrats orig cm_00000000.jpg
Now playing
Audio of Trump praising the Clintons and Democrats
cuomo lewandowski hillary clinton email exchange newday_00002327.jpg
Now playing
Cuomo grills Lewandowski on Clinton email 'hypocrisy'
Now playing
This video is no longer available
Now playing
Donald Trump thanks Anthony Wiener at rally
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