"Yes, you have to read President Trump's tweets, but you can't just get riveted on those. You need to follow the troops, follow the money, and follow the substance of policies."

Retired U.S. General David Petraeus has led troops into battle but he's as much an academic as he is an officer. This week he talks to Ian Bremmer about the the threats facing the United States today, both from without and within.

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