The Senate on Tuesday passed and will send to the White House a broad defense policy bill that would block the President from bringing terrorism suspects held in Guantanamo Bay, Cuba, to the United States.
Unknown is whether President Barack Obama - who made closing the detention center a key campaign promise - will veto the bill or sign it despite the Gitmo restrictions.
The overwhelming and bipartisan vote was 91 to 3, which means it has more than enough supporters to override a presidential veto, though Obama's Press Secretary Josh Earnest said the President would sign the defense bill.
Congressional Republicans are bracing this week for what they fear will be a decision by the President to cite his executive authority and order the prison closed.