Oliver North's Iran Solution

The Iranian nuclear situation is a tough one, with not a lot of easy answer.  Oliver North proposes a partial solution:

But there is one thing, short of war, he still could try -- before the ayatollahs finish building their bombs. He could issue an executive order barring any company, regardless of nationality, that does business with an Iranian government entity from doing any business in the United States.

Not a bad idea.  One problem is that an individual determined to subvert the best interests of the United States could probably find a way to sell arms Iran.  Right Ollie?