Republican plans to vote next week on embattled Supreme Court nominee Brett Kavanaugh derailed Friday after key undecided GOP senators joined Democrats in calling for a one-week delay to allow for an FBI probe into the sexual assault allegations against him.

The surprise move by Sen. Jeff Flake (R-Ariz.), quickly joined by Sen. Lisa Murkowski (R-Alaska), meant the divisive battle over President Trump’s pick for the high court will linger for at least a few more days.