“President Donald Trump keeps saying he wants to walk away from the $1 trillion-plus North American trade deal he negotiated in his first term. Nobody believes he will,” Politico reports.“But Trump’s refusal to commit to the tariff-lowering pact means that his administration must now enter a protracted period of negotiations with Mexico and Canada — extending what has already been a year of uncertainty for major U.S. industries like automakers and dairy farmers who rely on multibillion dollar supply chains and export markets across the continent.”