In just a few weeks, the Trump administration has taken a hard line with allies such as Mexico and Canada. Now, a trade war is on the horizon with Europe.Mark Landler, the London bureau chief of The New York Times, explains how a fracturing alliance with Europe could affect global political dynamics.Guest: Mark Landler, the London bureau chief of The New York Times.Background reading: 

• The European Union responded to American steel and aluminum tariffs with its own levies on boats and bourbon.
• Europe expected a transactional President Trump. It got something else.

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