FILE - In this May 17, 2016 file photo, House Armed Services Committee Chairman Rep. Mac Thornberry, R-Texas speaks during a news conference on Capitol Hill in Washington. Congress is poised to override President Barack Obama's veto of a bill that would allow families of Sept. 11 victims to sue Saudi Arabia for the kingdom's alleged backing of the terrorists who carried out the attacks that killed nearly 3,000 people. (AP Photo/Evan Vucci, File)