House Judiciary Committee Chairman Rep. Bob Goodlatte, R-Va., gives his opening remarks on Capitol Hill in Washington, Tuesday, Feb. 5, 2013, prior to the committee's hearing on America's Immigration System: Opportunities for Legal Immigration and Enforcement of Laws against Illegal Immigration. (AP Photo/Susan Walsh)

San Antonio, Texas Mayor Julian Castro, right, and his brother Rep. Joaquin Castro, D-Texas, center, talk with House Judiciary Committee member, Rep. Lamar Smith, R-Texas, all from San Antonio, on Capitol Hill in Washington, Tuesday, Feb. 5, 2013, prior to Mayor Castro testifying before the committee's hearing on America's Immigration System: Opportunities for Legal Immigration and Enforcement of Laws against Illegal Immigration. (AP Photo/Susan Walsh)

San Antonio, Texas Mayor Julian Castro testifies on Capitol Hill in Washington, Tuesday, Feb. 5, 2013, before the House Judiciary Committee hearing on America's Immigration System: Opportunities for Legal Immigration and Enforcement of Laws against Illegal Immigration. (AP Photo/Susan Walsh)

House Judiciary Committee member Rep. Luis Gutierrez, D-Ill., gives his opening remarks on Capitol Hill in Washington, Tuesday, Feb. 5, 2013, during the committee's hearing on America's Immigration System: Opportunities for Legal Immigration and Enforcement of Laws against Illegal Immigration. (AP Photo/Susan Walsh)

House Judiciary Committee member Rep. Trey Gowdy, R-S.C., gives his opening remarks on Capitol Hill in Washington, Tuesday, Feb. 5, 2013, during the committee's hearing on America's Immigration System: Opportunities for Legal Immigration and Enforcement of Laws against Illegal Immigration. (AP Photo/Susan Walsh)

San Antonio, Texas Mayor Julian Castro, left, talks with his brother Rep. Joaquin Castro, D-Texas, right, on Capitol Hill in Washington, Tuesday, Feb. 5, 2013, prior to testifying before the House Judiciary Committee hearing on America's Immigration System: Opportunities for Legal Immigration and Enforcement of Laws against Illegal Immigration. (AP Photo/Susan Walsh)

San Antonio,, Texas Mayor Julian Castro, right, testifies on Capitol Hill in Washington, Tuesday, Feb. 5, 2013, before the House Judiciary Committee hearing on America's Immigration System: Opportunities for Legal Immigration and Enforcement of Laws against Illegal Immigration. (AP Photo/Susan Walsh)

San Antonio, Texas Mayor Julian Castro, center, accompanied by his brother Rep. Joaquin Castro, D-Texas, second from right, gestures on Capitol Hill in Washington, Tuesday, Feb. 5, 2013, prior to testifying before the House Judiciary Committee hearing on America's Immigration System: Opportunities for Legal Immigration and Enforcement of Laws against Illegal Immigration. (AP Photo/Susan Walsh)