The U.S. Department of Homeland Security is planning to cut 50 percent of the budget for aerial surveillance along the U.S.-Mexico border, agents revealed at a congressional hearing Thursday. In an effort to understand why DHS is cutting funding, Texas's Republican Gov. Greg Abbott and Rep. Henry Cuellar, D-Texas, wrote a bi-partisan letter to DHS Secretary Jeh Johnson. "Any decrease in aerial observation is not only imprudent, but contradicts the very mission of border security enforcement," the letter states. The lawmakers' letter also asks for detailed information about the reduction aerial-based border security, also known as Operation Phalanx. Abbott and...