President Donald Trump has maintained his opposition to congestion pricing in New York and has spoken to Gov. Kathy Hochul (D-NY) twice in the past week about it. Hochul wants to keep the program, which has resulted in 1 million fewer vehicles entering the congested spots in Manhattan since its start on Jan.

New York City’s congestion pricing program has been in effect for nearly a month, charging drivers $9 to enter Manhattan south of 60th Street. While some residents say traffic has improved, the Trump administration is reportedly considering pulling federal approval for the tolling plan.

The New York City tolling program began on Jan. 5 after defying obstacles for decades. A move to stop it would likely touch off a legal battle between the state and federal government.