The Justice Department filed a lawsuit Wednesday against the state of New Jersey and Gov. Mikie Sherrill (D-NJ) over the state’s law banning federal immigration officers from wearing face coverings on the job.

The federal government argued that the New Jersey law violates the Supremacy Clause of the Constitution, which gives federal laws precedence over conflicting state laws. The DOJ also argues that the law banning Immigration and Customs Enforcement officers from wearing face masks is an inherent safety threat to immigration officers who have faced threats and public doxxing.