New Jersey Gov. Chris Christie believes World War III has already started and Russia cannot be trusted.

In the aftermath of the fifth Republican presidential debate on Tuesday night in Las Vegas, Christie talked about his proposal for a no-fly zone in Syria and said it would mean shooting down Russian planes if necessary. He told CBS's Charlie Rose Wednesdsay morning that it's a mistake to assume Russia is helping the U.S. fight the Islamic State.

"You're assuming that Russia is our ally in the fight against ISIS and I don't believe that that's the case," Christie said.

"I think the secretary of state feels that way," Rose interjected, referring to John Kerry.

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