All year, a case has been pending in the U.S. Supreme Court on the federal law that limits how much political parties may spend on the campaigns of their own nominees, assuming the party and the nominee coordinate with each other. The case is National Republican Senatorial Committee v FEC, 24-3051.
The FEC still hasn’t filed a brief in defense of the law. The FEC response deadline has been postponed four times. It was due January 6, then February 6, then March 10, then April 9, and is now due May 9.