'Trump's not smart!': MSNBC's Nicolle Wallace reveals the simple reason why the president 'hates NATO'

MSNBC's Nicolle Wallace on Tuesday explained the simple reason why Donald Trump despises the North Atlantic Treaty Organization.

Her comments came during a fiery exchange with Rick Stengel, the former Undersecretary of State for Public Diplomacy while a panel responded to a New York Times report warning that Trump may pull out of NATO. 

Stengel noted that Russia had worked for years to sow discord in the treaty organization but that never "in his wildest vodka-induced dreams did Vladimir Putin ever think an American president would undermine" NATO.

"I don't quite understand the genesis of where Trump's animosity to NATO has come from," the former high-ranking State Department official said.

"Well, why is it a mystery?" Wallace pressed. "It's because Putin hates NATO."

After going back and forth about where Trump's praise for the Soviet strategy in Afghanistan came from, the host laid down the law.

"I think we should stop guessing," Wallace said. "We have our answer -- Trump's not smart!"

Watch below: