US President Donald Trump said on Thursday that his proposed 25 per cent tariffs on Mexican and Canadian goods will go into effect on March 4 as scheduled because drugs are still pouring into the US from those countries.

Trump also said he would impose an additional 10 per cent duty on Chinese goods on that day – on top of the 10 per cent tariff that he levied on Feb. 4 on imports from China.

Trump said drugs were still flowing into the US at “very high and unacceptable levels,” with a large percentage of them the deadly opioid fentanyl.

“We cannot allow this scourge to continue to harm the USA, and therefore, until it stops, or is seriously limited, the proposed TARIFFS scheduled to go into effect on MARCH FOURTH will, indeed, go into effect, as scheduled,” Trump said in a post on his Truth Social media site.

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“China will likewise be charged an additional 10 per cent Tariff on that date.”

The statement cleared up some confusion on Wednesday over deadlines for the punishing tariffs on Canadian and Mexican goods that Trump has threatened over the fentanyl crisis and US border security.

Trump’s comments on the matter during his first cabinet meeting on Wednesday seemed to suggest that he may push the deadline back for about one month, until April 4.

Comments from Trump administration officials indicated that the April deadline was for Trump’s “reciprocal tariffs” to match import duty rates of other countries and offset their other restrictions.

His trade advisers consider European countries’ value-added taxes to be akin to a tariff. Kevin Hassett, the top White House economic adviser, told CNBC television that Trump would determine new tariffs after a study is completed by April 1.

“The schedule is that there’s a study coming out on April 1, and after that, the president is going to decide what to do about tariff policies for all countries,” he said, but specifically mentioning Mexico and Canada.

Meanwhile, Mexican Economy Minister Marcelo Ebrard will meet with newly confirmed U.S. Trade Representative Jamieson Greer on Thursday and Commerce Secretary Howard Lutnick on Friday in an effort to head off the tariffs.

In Canada, Public Safety Minister David McGuinty said on Thursday that the progress Canada has made on tightening security along the border with the United States and combating drug smuggling should satisfy the Trump administration.

China, in a letter to US Trade Representative Jamieson Greer, said China and the United States should address concerns in economic and trade fields through equal dialogue and consultation.