President Obama will likely veto controversial legislation empowering the families of 9/11 victims to sue Saudi Arabia if that nation is found legally liable for supporting the deadliest terrorist attack in U.S. history, the White House said on Monday.

The White House’s position on legislation that unanimously passed both chambers of Congress potentially sets up a showdown on an emotionally charged topic. The president has vetoed 10 pieces of legislation during his tenure in office.

Bipartisan support for the measure — which is co-sponsored by Sen. Chuck Schumer, D-New York, and Sen. John Cornyn, R-Texas — could lead to the first veto override of Obama’s presidency.

The White House worries that the measure could open the floodgates to similar suits and put diplomats and business leaders at risk.

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