(via FOX News) - 

President Obama, just hours before it was set to become law, on Friday vetoed a bipartisan bill allowing families of 9/11 victims to sue the government of Saudi Arabia – setting up a showdown with Congress where lawmakers on both sides of the aisle aim to override the president’s decision.

Even House Democratic Leader Nancy Pelosi indicated support this week for an override, saying members believe the families “should have their day in court.” If Congress is successful, it would mark the first veto override of Obama’s two-term presidency. 

The rare standoff uniting Republican and Democratic lawmakers comes just days after the 15th anniversary of the terror attacks, and concerns a piece of legislation that is widely supported on Capitol Hill.

More from FOXNews.com