Judge Brett Kavanaugh’s confirmation to the U.S. Supreme Court has Democrats and liberal activists who opposed his confirmation coalescing around their next strategy: attacking the legitimacy of the nation’s highest court.

The Senate on Saturday officially voted to confirm Kavanaugh by a vote of 50-48. Kavanaugh’s confirmation process was derailed over the past month by a series of sexual misconduct allegations that Democrats used to demand President Donald Trump withdraw Kavanaugh’s nomination.