From the letter:

The American Civil Liberties Union urges you to vote NO on H.R. 1526, the “No Rogue Rulings Act of 2025.” This bill would prohibit federal district courts from issuing injunctive relief that extends beyond the parties to a particular case. This means that federal district courts would no longer be allowed to issue nationwide injunctions when examining federal policies, even if those policies have a nationwide effect.

Text: https://www.congress.gov/bill/119th-congress/house-bill/1526/text

Here I thought I was keeping up with the firehose, but this legislation is really insane. Only appellate courts could issue injunctions that apply beyond the parties and those represented by a party (e.g., class action).

This law would mean that every case is an individual determination. Every single wronged person would have to sue to enjoin a law that violates basic human rights.

This means that instead of Trump doing something blatantly illegal and unconstitutional and a court issuing an order immediately enjoining it, it may be months or years where he can act illegally before a higher court rules on it.