Arizona prosecutors pressing the case against Republicans who are accused of trying to overturn the 2020 election results in President Donald Trump’s favor were dealt a setback when a judge ordered the case be sent back to a grand jury.

Such rulings are not common but they are also not entirely unheard of, according to attorneys both working on the case and not affiliated with it.

The ruling is a blow to the case pursued by Attorney General Kris Mayes that alleges a coordinated attempt to interfere in the 2020 election.