Illegal crossings across the U.S.-Canada border rise sharply

The U.S.-Mexico border is constantly in the headlines, but what about security of the northern U.S. border with Canada? Reports show that illegal crossings there have increased 142 percent from 2017 to 2018. Porter Fox, author of the new book "Northland: A 4,000 Mile Journey Along America's Forgotten Border," joins CBSN with more.