O'Reilly asked Trump whether he "respects" the former KGB agent:

"I do respect him, but I respect a lot of people," Trump said, "That doesn't mean I'm going to get along with him."

Trump said he would appreciate any assistance from Russia in the fight against ISIS terrorists, adding that he would rather get along with the former Cold War-era foe than otherwise.

"But, [Putin] is a killer," O'Reilly said.

"There are a lot of killers," Trump responded, "We've got a lot of killers. What do you think? Our country's so innocent?"