Peterson Institute for International Economics President Adam Posen says he's more worried about escalation in North America between the US and Canada than he is about escalation between the US and China in the near term. He says that President Trump is aiming to create a "fortress America" and that the tariffs against China are the start of an asymmetric conflict between the two countries, and that China's retaliation in the guise of its investigation into Google (GOOGL, GOOG) brings things "a level higher". He spoke with Bloomberg's Manus Cranny on Bloomberg Brief.

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