New details have emerged in the court case against the gunman behind the 2022 mass shooting in Buffalo.

A U.S. District judge rejected a motion to dismiss the federal indictment of Payton Gendron, whose attorneys argue that the case violates the Constitution, specifically that it didn't meet procedural established by the 2009 Hate Crimes Prevention Act.

Court documents show that the judge disagreed, finding the government's use of that law to charge Gendron was correct.

He is set to face the death penalty when the federal trial begins in September.

Gendron shot and killed 10 Black people and injured three others at a grocery store in East Buffalo on May 14, 2022. He's already serving a lifetime prison sentence after pleading guilty to state charges including murder and domestic terrorism motivated by hate.