Article I, Section 7 of the United States Constitution grants the authority to Congress the ability to override a presidential veto, should the Congress muster a 2/3 vote from both Houses to do so. The first time it actually happened was during the presidency of Democrat President Andrew Johnson, who vetoed bills during the reconstruction period he believed to be too harsh against the former Confederate States. Once again, a Democrat President's veto has been overridden by Congress. Congress overwhelmingly rejected President Obama’s veto of The Justice Against Sponsors of Terrorism Act, or JASTA, bill letting families of September 11 victims sue the Saudi Arabian government. The legislation gives victims' families the right to sue in U.S. court for any role that elements of the Saudi government may have played in the 2001 attacks. Fifteen of the 19 September 11 hijackers were Saudi nationals.