Trump's Mexico Tariff Threat Rattles Markets

P.M. Edition for May 31st: President Trump's threat to impose escalating tariffs on Mexico roiled markets on Friday, sending the Dow down more than 300 points and throwing into question a new trade agreement between the U.S., Mexico, and Canada. The Wall Street Journal's Josh Zumbrun has the latest. Plus, WSJ's Erin Ailworth reports on a record number of U.S. tornadoes this May.

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