United States President Donald Trump has announced the imposition of global tariffs at 15 per cent, continuing his criticism of a Supreme Court ruling that invalidated his prior import taxes.

On Friday, Trump stated that he would substitute the tariffs nullified by the court with a 10 per cent levy on all goods entering the US.

However, on Saturday, he posted on Truth Social that this rate would be escalated to the maximum permitted under a previously unused trade law.

The tariffs are scheduled to take effect on Tuesday, 24 February, and can remain in place for approximately five months before requiring congressional approval.

This 15 percent tax rate poses uncertainties for nations like the UK and Australia, which had previously negotiated a 10 percent tariff agreement with the US.

Trump explained that his administration decided to implement the levy after reviewing the “ridiculous, poorly written, and extraordinarily anti-American decision on Tariffs issued yesterday”.

In a 6-3 ruling, the Supreme Court determined that the president exceeded his authority by enacting broad global tariffs last year under the 1977 International Emergency Economic Powers Act.

Trump’s tariffs form a central element of his economic strategy, which he claims will incentivize businesses to invest and manufacture products domestically rather than abroad.

Right after the ruling, Trump expressed that he was “ashamed of certain members of the court” and labeled the justices who opposed his trade policy as “fools”.

The majority opinion striking down the tariffs included the court’s three liberal justices, Chief Justice John Roberts—a conservative appointed by George W. Bush—and two Trump-nominated justices: Amy Coney Barrett and Neil Gorsuch.

The dissenting votes came from three conservative justices: Clarence Thomas, Brett Kavanaugh, and Samuel Alito.