NEW YORK — President-elect Donald Trump is threatening to impose sweeping new tariffs on Mexico, Canada and China as soon as he takes office as part of his effort to crack down on illegal immigration and drugs.

The tariffs, if implemented, could dramatically raise prices on everything from gas to automobiles to agricultural products. The U.S. is the largest importer of goods in the world, with Mexico, China and Canada its top three suppliers, according to the most recent U.S. Census data.

Trump made the threats in a pair of posts on his Truth Social site Monday evening in which he railed against an influx of illegal migrants, even though southern border apprehensions have been hovering near four-year lows.

“On January 20th, as one of my many first Executive Orders, I will sign all necessary documents to charge Mexico and Canada a 25% Tariff on ALL products coming into the United States, and its ridiculous Open Borders,” he wrote, complaining that “thousands of people are pouring through Mexico and Canada, bringing Crime and Drugs at levels never seen before,” even though violent crime is down from pandemic highs.

He said the new tariffs would remain in place “until such time as Drugs, in particular Fentanyl, and all Illegal Aliens stop this Invasion of our Country!”

“Both Mexico and Canada have the absolute right and power to easily solve this long simmering problem. We hereby demand that they use this power,” he went on, “and until such time that they do, it is time for them to pay a very big price!”

Trump also turned his ire on China, saying he has “had many talks with China about the massive amounts of drugs, in particular Fentanyl, being sent into the United States – But to no avail.”

“Until such time as they stop, we will be charging China an additional 10% Tariff, above any additional Tariffs, on all of their many products coming into the United States of America,” he wrote.

It is unclear whether Trump will actually go through with the threats or if he is using them as a negotiating tactic before he takes office in the new year.

Trump’s nominee for treasury secretary, Scott Bessent — who if confirmed, would be one of several officials responsible for imposing tariffs on other nations — has on several occasions said tariffs are a means of negotiation with other countries.

He wrote in a Fox News op-ed last week, before his nomination, that tariffs are “a useful tool for achieving the president’s foreign policy objectives.