Why Nobel economist Paul Krugman thinks Trump's trade war will make Americans 'measurably poorer'

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• Paul Krugman warns that Trump's trade policies are a threat to the US economy.
• Trump's tactics are leading to strained relations with trade partners, Krugman says.
• He predicts a "divorce" between the US and major trading partners.

Paul Krugman thinks Americans will ultimately be the biggest losers of chaotic US trade policy.

The Nobel Prize-winning economist thinks Donald Trump's trade policies...