Paul sharply denounced Christie's position during Tuesday night's fifth GOP debate in Las Vegas, calling his advocacy for a no-fly zone dangerous and comparing him to former secretary of state Hillary Clinton.
"Well, I think if you're in favor of World War III, you have your candidate," Paul said Tuesday. "My goodness, what we want in a leader is someone with judgment, not someone who is so reckless as to stand on the stage and say, 'Yes, I'm jumping up and down; I'm going to shoot down Russian planes.'"
Paul added that although he disapproves of Russia's efforts on behalf of Syrian President Bashar al-Assad, declaring a no-fly zone when "Russia already flies in that airspace" would represent a serious lapse in judgement.
Christie on Wednesday questioned Russia's commitment to fighting the Islamic State, knocking President Obama and former secretary of Clinton for their diplomatic efforts.
"We know how Russian troops in Crimea, we have them disrupting Ukraine," Christie said. "They are aligning with the Iranians to try to create and Iranian empire across the Middle East. I don't call that a friend."