President Donald Trump called one Supreme Court justice his "new hero" after the high court blocked his presidential tariff powers in a 6-3 ruling.

Feb. 21 (UPI) -- President Donald Trump said he will raise global tariffs from 10% to 15% after the Supreme Court on Friday ruled that his emergency tariffs are illegal.

The court made something clear to Americans that may not have been clear before yesterday's ruling.

In rejecting President Trump’s tariffs, the court’s six conservative justices displayed subtle differences in their views of executive power.

It is unclear what happens to the deals made with trading partners now that President Donald Trump’s tariffs have been found illegal by the US Supreme Court, says Hinrich Foundation’s Deborah Elms.

The never-used Section 122 authority allows the US president to impose duties of up to 15 per cent for a maximum of 150 days on any and all countries to address "large and serious" balance of payments issues.