New York officials have said they would not halt collection of the toll unless ordered to do so by the courts.

In a letter sent from U.S Transportation Secretary Sean Duffy to Gov. Kathy Hochul on Monday, set a new deadline to end congestion pricing—May 21. New York will have until that date to either end the program or “prove their actions are not illegal,” according to a statement from Duffy, a member of President Donald Trump’s administration.

The Trump administration is threatening to stop future federal approvals for transportation projects in Manhattan and may withhold funding if New York City’s congestion pricing program continues.