Attorney General Barr Investigates Origins of Russia Probe

P.M. Edition for May 17th: Attorney General William Barr says his investigation into the origins of the Russia probe could prompt rule changes for investigations of political campaigns. The Wall Street Journal's Aruna Viswanatha has more details. Plus, a roundup of tariff updates, as the U.S. announces a deal with Canada and Mexico - and decides to delay a decision on automobile tariffs.

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