New York's congestion pricing has led to 1 million total fewer vehicles entering the busiest part of Manhattan and cut commuting times since the program began on Jan. 5, a transit agency said on Wednesday.

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.

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.

The Donald Trump Department of Transportation is actively considering its options to kill New York’s congestion pricing plan, just three weeks after it started, two sources told The New York Times. The paper reported Thursday that the Trump administration is weighing whether it can pull the plug on “a key federal authorization” granted by the Biden administration last year.

President Donald Trump may move to halt congestion pricing in New York City, a move that may be welcomed by Gov. Phil Murphy, who has opposed it.