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.

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.