President Donald Trump is facing a "self-inflicted disaster" on the economy, a Nobel Prize-winning economist has said.

A federal appeals court ruled on Friday that most of Trump's tariffs were imposed unlawfully, upholding an earlier decision by the Court of International Trade.

The ruling does not outlaw tariffs themselves, but found that Trump's method—using the 1977 International Emergency Economic Powers Act (IEEPA) to declare an "economic emergency" and unilaterally setting tariff rates without congressional approval—violated the law.

"One crucial thing to understand is that Trump is facing a completely self-inflicted disaster here," Paul Krugman, who received the Nobel Prize in Economic Sciences in 2008, wrote in a blog post.

"He probably could have gotten Republicans in Con

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