President Trump said that he was considering using the federal Department of Transportation to “kill” congestion pricing, which he claimed was deterring people from coming into Manhattan.

But Mr. Trump, in a weekend interview with The New York Post, was vague about how he might try to stop the program. Options could include withholding federal transportation funds or revoking a key federal authorization to toll drivers. He also said that he was still in discussions with Gov. Kathy Hochul about the future of congestion pricing and other matters.

The president also vowed in the interview to eliminate bike lanes, which are approved by the New York City Department of Transportation. “They’re dangerous. These bikes go at 20 miles an hour. They’re whacking people,” he said.

Charging most vehicles a $9 fee to enter Manhattan below 60th Street is “destructive” to New York, the president said.

“If I decide to do it, I will be able to kill it off in Washington through the Department of Transportation,” Mr. Trump said.

Ms. Hochul and President Trump spoke twice in the last week of January about the tolling program, which is designed to reduce congestion and provide billions of dollars in funding for badly needed repairs and upgrades for the subway, buses and commuter railroads.