Republican presidential nominee Donald TrumpDonald TrumpBannon reasserts influence in 100 days push Trump: I was 'psyched to terminate' NAFTA Trump: 'Major, major' conflict with North Korea possible MORE on Monday slammed the nation's leaders and predicted more attacks after the explosions this weekend in New York City and New Jersey.
"Because we've been weak. Our country's been weak. We're letting people in by the thousands and tens of thousands. I've been saying you've got to stop it."
Trump went on to slam President Obama's plan to admit 110,000 refugees into the United States over the next year.
"Hillary wants to increase what he's let in and he's let in thousands and thousands of people," Trump said.
"They don't know. They can't be properly vetted. There's no way."
The GOP nominee said he's spoken with law enforcement who say there's no way to vet these refugees.
"He let in over 100,000 additional people and now Hilary Clinton is raising it by 550 percent and this has been going on for a long time, thousands of people are pouring into our country, we have no idea what we're doing," Trump said.
"Our leaders are — I don't even say weak — I say stupid."
His comments come after a bomb detonated Saturday in Manhattan, injuring 29 people. Two other bombs, one of which detonated near a train station, were discovered in New Jersey.
Authorities now say they suspect an active terrorism cell in New York and New Jersey.