what a joke.
Who currently trades with N. Korea? Only nations that we have Little to NO influence on (and losing more by the day since Trump got in). 

The ONLY one that matters is China, and China OWNS Trump. They allowed his family to have some IP, so that Trump would turn traitor Against America, just like he has with Russia. 

And Gardner thinks that we can bring more pressure on N. Korea? 
He is lying. He KNOWS that we can not, but wants to claim that they are attempting things. 
What he is claiming is less possible than trying to herd a million cats.