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President Donald Trump announced Saturday he is raising a global tariff to 15% following a ruling this week by the Supreme Court.

"Based on a thorough, detailed, and complete review of the ridiculous, poorly written, and extraordinarily anti-American decision on Tariffs issued yesterday, after MANY months of contemplation, by the United States Supreme Court, please let this statement serve to represent that I, as President of the United States of America, will be, effective immediately, raising the 10% Worldwide Tariff on Countries, many of which have been ‘ripping’ the U.S. off for decades, without retribution (until I came along!), to the fully allowed, and legally tested, 15% level," Trump wrote on Truth Social.

"During the next short number of months, the Trump Administration will determine and issue the new and legally permissible Tariffs, which will continue our extraordinarily successful process of Making America Great Again - GREATER THAN EVER BEFORE!!!" Trump added.

Trump on Friday had signed an order imposing a 10% "global tariff" following the Supreme Court's 6-3 decision that he does not have the authority to levy sweeping tariffs under a specific emergency powers law.

"It is my Great Honor to have just signed, from the Oval Office, a Global 10% Tariff on all Countries, which will be effective almost immediately," Trump wrote in a Truth Social post Friday evening.

The order was issued under Section 122 and applies in addition to the standard tariffs that are already in place, the president announced during a White House press briefing Friday afternoon.

The high court blocked Trump's tariffs levied under the International Emergency Economic Powers Act in what amounts to a major test of executive branch authority.

The president noted he will pursue "alternatives" to tariffs under emergency law.

Trump called the ruling "deeply disappointing," saying he was "ashamed" of certain members of the court.

This is a developing story. Please check back for updates.

Fox News' Alexandra Koch, Alex Nitzberg, Jacqui Heinrich and Charles Creitz contributed to this report.