Democrats and Republicans are speaking out against the surprising pullback of US troops from northern Syria, saying the Kurdish forces that helped defeat the Islamic State could be at risk. We’ll explain the pushback Trump’s big move is facing on Capitol Hill. Meanwhile: efforts to keep President Trump’s tax returns a secret hit a legal snag on Monday. We’ll survey the pressure he’s under to make the documents public. Also on today’s show: Millennial investment habits and how the secret life of red blood cells could offer clues about treating cancer.

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