Our courts are a system of local, state, and federal judges - each making decisions in their own jurisdiction. Nationwide injunctions are court orders that prevent the government from enforcing a law or policy nationwide, not just for the parties in a specific lawsuit.
Republicans are trying to end nationwide injunctions and the consequence would be complete chaos - allowing Trump to commit unconstitutional actions in regions of the country with jurisdictions covered by MAGA judges.
Last month, our courts saved us from a complete fascist takeover using nationwide injunctions: