President Obama followed through on his pledge to veto a bill that would allow families of Sept. 11 victims to sue Saudi Arabia in U.S. federal court.

Obama vetoed the bill late Friday afternoon, setting up a potential showdown with lawmakers. Congress may decide to try to override the veto of the popular bipartisan legislation but would need a two-thirds vote in both the House and Senate in order to do so. None of his previous vetoes have been overridden.