Donald Trump Threatens Countries That Would 'Play Games' With Tariffs

US President Donald Trump threatened nations Monday with punishing tariff hikes if they "play games" after his trade policy setback before the Supreme Court -- hours before new duties were set to kick in. 

"Any Country that wants to 'play games' with the ridiculous supreme court decision, especially those that have 'Ripped Off' the U.S.A. for years, and even decades, will be met with a much higher Tariff, and worse, than that which they just recently agreed to," Trump wrote on



social media.

The high court struck down Trump's global tariffs last Friday, ruling that he had exceeded his authority in tapping emergency economic powers to impose them. 

This dealt a sharp blow to Trump's economic agenda, of which tariffs -- and his ability to impose them rapidly -- have been a key feature. In a notice posted late Sunday, US Customs and Border Protection said it would stop collecting tariffs struck down by the court starting Tuesday.