A recent court decision allows the US president to start applying parts of a decree aimed at restricting mail-in voting. The decree, issued in March, gives the US Postal Service and the Department of Homeland Security unprecedented roles in election administration.

The decision introduces uncertainty about voting rules for upcoming elections. Further challenges to the decree could still hinder its implementation before the November elections.

Details about the court's decision and its potential impact are available from the source, including information about the judges' opinions and the decree's provisions.