WASHINGTON – President-elect Donald Trump vowed Monday that on his first day in office he would impose a 25% tariff on all products coming into the United States from Mexico and Canada.

“As everyone is aware, thousands of people are pouring through Mexico and Canada, bringing Crime and Drugs at levels never seen before,” Trump wrote in a post on his social media platform Truth Social.

Trump said that on Jan. 20, in one of his first executive orders, he would sign all the necessary paperwork to levy a 25% tariff on all products arriving from the U.S.’s North American neighbors.

Start the day smarter. Get all the news you need in your inbox each morning.

“This Tariff will remain in effect until such time as Drugs, in particular Fentanyl, and all Illegal Aliens stop this Invasion of our Country!” he wrote. “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, and until such time that they do, it is time for them to pay a very big price!”

Trump said in another Truth Social post that he also would levy an additional 10% tariff on top of existing tariffs on Chinese products coming into the United States.

"I have had many talks with China about the massive amounts of drugs, in particular Fentanyl, being sent into the United States – But to no avail," he wrote. "Representatives of China told me that they would institute their maximum penalty, that of death, for any drug dealers caught doing this but, unfortunately, they never followed through."

Trump said the additional tariff on Chinese goods would remain in place until it stops allowing illegal drugs to pour into the U.S.

Throughout his presidential campaign, Trump threatened to crack down on illegal migrant crossings along the U.S.’s southern border with Mexico and to curb the flow of illegal drugs into the country. He has vowed to declare a national emergency and use military assets to deport a record number of immigrants who are in the United States illegally.

Despite Trump's claim that drugs and crime are at never-before-seen levels, violent crime in the United States actually declined for the third straight year in 2023, including instances of murder, rape and assault, according to estimates released by the FBI in September.

Trump's decision to use tariffs as a weapon to fight illegal immigration and drugs could be a double-edged sword. Economists warn that slapping tariffs onto products shipped into the United States could drive up inflation and interest rates and result in higher consumer prices.Tariffs are taxes on merchandise shipped to the U.S. from other countries. Tariffs are paid by importers, not by the countries from where the goods are shipped. Importers typically pass those costs along to consumers by raising the price of each product, making them more expensive.

During his first term as president, Trump escalated trade tensions with China by slapping tariffs on billions of dollars of Chinese-made goods. Trump said he was trying to force Beijing to open Chinese markets to more American products and protect the intellectual property of U.S. companies. The two countries eventually signed a trade deal that called on Beijing to buy more American goods and services and set the stage for ongoing talks.

Trump had hoped to secure a second trade deal with China, but those plans fell apart with the arrival of the coronavirus pandemic in 2020.