Arrests for illegal crossings from Canada spiked in the last fiscal year, but remain a fraction of the number of those from Mexico.

Trump border czar calls northern border ‘extreme national security vulnerability’ and says it ‘can’t be a gateway to terrorists coming to the United States’

Many of the U.S. products were chosen for their political rather than economic impact. For example, Canada imports just $3 million worth of yogurt from the U.S. annually and most of it comes from one plant in Wisconsin, the home state of then-Republican House Speaker Paul Ryan. That product was hit with a 10% duty.