The top federal prosecutor in Minnesota is urging an appeals court to move quickly over a key immigration enforcement dispute, saying his office is buckling under a flood of lawsuits against the Trump administration’s mass deportation push in the Twin Cities.

U.S. Attorney Daniel Rosen, an appointee of President Donald Trump, said his short-staffed office has been forced to abandon “pressing and important priorities” to manage hundreds of emergency habeas petitions filed by immigrants arrested and detained during Operation Metro Surge. In a Jan. 30 filing to the U.S. Court of Appeals for the 8th Circuit, Rosen disclosed that 427 immigration-related habeas cases were filed in the District of Minnesota in January alone, with the pace expected to continue into February.