The State also raised concerns about delays with mail-in ballots ahead of the November election.
Attorney General Xavier Becerra is already part of a multi-state coalition of attorneys general suing Postmaster General Louis DeJoy. They accuse President Trump and DeJoy of trying to sabotage the election.
Protests have happened across the country with postal workers and customers voicing frustration.
Protesters rally around SoCal in support of U.S. Postal Service amid challenges