EXCLUSIVE — A coalition of conservatives and legal groups sent a letter to Congress on Monday urging lawmakers to pass the “Keep 9” constitutional amendment to curb Democrats’ threats of adding additional justices to the Supreme Court.The Constitution does not set the Supreme Court at a specific number of justices, but the high court’s bench has remained at the current nine-justice configuration since 1869. With the court’s current 6-3 conservative majority, left-wing groups and some Democrats have increasingly called for expanding it to 13 members, seemingly to flip the ideological balance of the high court. A coalition of conservative and legal organizations, led by Advancing American Freedom President Tim Chapman and Liberty Justice Center Chairwoman and CEO Sara Albrecht, sent a letter to members of Congress urging them to maintain the high court’s independence by locking in the number of justices at nine via a constitutional amendment.“For over 150 years, the Supreme Court has consisted of one chief justice and eight associate justices. Although a nine-justice Court is not constitutionally required, adding justices now would serve no purpose but to politicize, and thus undermine the legitimacy of, the Court and its rulings,” said the letter, shared exclusively with the Washington Examiner.