By law the FTC, like the FCC, cannot have more than 3 commissioners from the same party. When there is an opening and there are already 3 from the President's

By law the FTC, like the FCC, cannot have more than 3 commissioners from the same party. When there is an opening and there are already 3 from the President's party traditionally the President asks the Senate leader of the other party who should be nominated and the Senators of the President's party do not vote against that nominee.