After the Islamic terror attack in Nice that killed 80+ people, including children, Trump has called for a declaration of war. This is war. If you look at it, this is war coming from all different parts."
Trump warned again about the danger of allowing Muslims into America.
He reiterated his belief that "we have to be tough" and his view that the U.S. should reverse its decision to allow Syrian refugees into the country.
"You know, in the old days, we would have uniforms, you knew what you were fighting. We are allowing people into our country who we have no idea where they are, where they're from, who they are, they have no paperwork, they have no documentation, in many cases," Trump said.
Indiana Gov. Mike Pence, who on Thursday accepted Trump's offer to be his running mate, also issued a statement on the attack, which he said was "a horrific reminder of the threat facing Western civilization."
"As we mourn with the people of France, we must resolve to bring justice all those responsible and defeat this enemy of civilization at its source," Pence said.