Will Congress get enough votes to override his veto? We'll have to wait and see.

Obama to Veto 9/11 Lawsuit Bill. Says US Is At Risk to Lawsuits as Anyone
by Jason Ditz, Antiwar,com
Sep 12, 2016
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[snip]

White House officials continue to insist that President Obama intends to veto the Justice Against Sponsors of Terrorism Act (JASTA), which unanimously passed in both the House and Senate, claiming that the weakening of the principle of sovereign immunity is a danger to the US.

JASTA is designed to allow victims of 9/11 to sue Saudi Arabia over the attack, based on Saudi government involvement in the scheme, as detailed by the 9/11 Report’s 28 pages. Saudi Arabia has threatened to collapse the US Treasury market in retaliation.

While the Saudi threats are believed to play a significant behind the scenes role in the White House veto threat, today they insisted that the chief concern was that the weakening of sovereign immunity is as much a risk to the US as anyone “given the way the United States is engaged in the world.”