I support legal immigration and enhanced measures for border security. Our national security extends beyond protecting our borders. Visa overstays are our largest source of illegal immigration. An estimated 40 percent of the approximately 11 million illegal immigrants in the U.S. overstayed their visas. The border wall helps keep illegal immigrants at bay, but it will not keep visitors from overstaying their visas. I support enhanced entry-exit technologies and data to track visa holders.