President Trump said on Saturday he's raising global tariffs to 15%.

"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," he wrote. 

"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. 

The Supreme Court ruled on Friday that Trump lacks emergency authority to charge tariffs unilaterally without Congress under a 1977 law.