The Trump administration is threatening to withhold federal funding from the agency that runs the New York City subway if the Metropolitan Transportation Authority doesn’t comply with a request for information on transit crime.

In a letter to MTA Chair Janno Lieber, U.S. Transportation Secretary Sean Duffy demanded a list of “actions and plans to reduce crime on its system,” including rates of assaults, fare evasion and train surfing in the subway.

The Trump administration is threatening to withhold or redirect federal funding to New York’s mass transit system if it doesn’t receive documentation of the steps taken to address crime and create a safe environment for riders and workers.