"The U.S. has all the leverage in the world, but j

"The U.S. has all the leverage in the world, but just because you can doesn't mean you should. When you take your best friend, your greatest ally in the world, and start squeezing them, you can win, but I will tell you, the relationship will be damaged much longer than it will take the ink to dry on a new NAFTA deal," said Heyman.