WASHINGTON, DC - JULY 10:  U.S. Homeland Security Secretary Jeh Johnson testifies before the Senate Appropriations Committee in the Dirksen Senate Office Building on Capitol Hill July 10, 2014 in Washington, DC. Johnson and officials from the Obama Administration are asking Congress to approve and emergency supplemental request of $3.7 billion to help with the sharp increase in the number of unaccompanied children who are crossing the U.S.-Mexico border.  (Photo by Chip Somodevilla/Getty Images)