‘Nothing is free’: legal questions over Trump's profiting from foreign sources remain unresolved

Guests: Sen. Elizabeth Warren, Jennifer Welch, Dr. Peter Hotez, Omar El Akkad.

Tonight, Donald Trump's first big foreign trip: Elizabeth Warren on the Trump corruption tour of the Middle East. Then, even after Trump backs down with China, the real and growing concern over trade war pain. Plus, why is America's top public health official bathing in a creek flowing with sewage and bacteria?

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