Kerry slams Trump's wall, tells grads to prepare for 'borderless world'

Secretary of State John Kerry took a shot at Donald Trump during his Friday commencement speech at Northeastern University, by saying no wall is big enough to keep dangerous terrorists out of the United States.

"Many of you were in elementary school when you learned the toughest lesson of all on 9/11," he said. "There are no walls big enough to stop people from anywhere, tens of thousands of miles away, who are determined to take their own lives while they target others."

"So I think that everything that we've lived and learn tells us that we will never come out on top if we accept advice from sound-bite salesmen and carnival barkers who pretend the most powerful country on Earth can remain great by looking inward," Kerry added. "And hiding behind walls at a time that technology has made that impossible to do and unwise to even attempt."

Kerry didn't mention Trump by name, but Trump has repeatedly called for a wall on the southern U.S. border, and many Democrats, and some Republicans, have taken to calling him a carnival barker.