Donald Trump ups global tariffs to 15% after lashing out at 'anti-American' Supreme Court ruling

The Supreme Court found that the president had overstepped his powers when he introduced sweeping global tariffs last year using a 1977 law known as the International Emergency Economic Powers Act.

The Republican held a press conference to announce a 10 per cent global tariff on goods entering the US, brazenly declaring "I can do whatever I want".

But on Saturday, he announced on Truth Social that this would be increased to 15 per cent, that would come into force on Tuesday.

The new duties will be invoked under Section 122 of the Trade Act of 1974, and can only stay in place for around five months before the administration must seek congressional approval.

Mr Trump is said to have gone "ballistic" behind closed doors after the latest Supreme Court ruling - which has been described as the first major challenge to his authority.

The US President described a "thorough, detailed, and complete review of the ridiculous, poorly written, and extraordinarily anti-American decision on Tariffs".

He said: "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 per cent 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 per cent level.

"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. Thank you for your attention to this matter".

The president previously described The Supreme Court's ruling on tariffs as "deeply disappointing," stressing shame of certain members of the court for "not having the courage to do what's right for our country".

He claimed the Democrats in the court were thrilled, expecting them to automatically vote against the Presidents developments.

"They're against anything that makes America strong, healthy and great again. They also are a frankly disgrace to our nation," he added.

Mr Trump's America First programme includes a series of domestic and foreign policy designed to serve specifically in the interests of the nation's citizens.

Following the court's ruling, a Government spokesman confirmed British officials would work with the White House to "understand how the ruling will affect tariffs for the UK and the rest of the world".

He added the UK "enjoys the lowest reciprocal tariffs globally, and under any scenario we expect our privileged trading position with the US to continue".

However, British businesses were soothed - being assured they would be supported while further details about the tariffs are announced.

"Under any scenario, we expect our privileged trading position with the US to continue and will work with the administration to understand how the ruling will affect tariffs for the UK and the rest of the world," he said.