It was a chilling moment: an eager crowd calling for an American citizen and United States congresswoman to be sent back to her native Somalia, as the president of the United States — whose protracted denunciation sparked their chant — silently let it run its course. But what’s become a story about malignant American nativism started out, not too long ago, as a story about a tactical, ideological, and generational split inside the Democratic Party. After a quick back-and-forth with Peter Kadzis, Adam Reilly sizes up the Squad versus Nancy Pelosi versus Donald Trump with Jen Deaderick, the author of She the People, and opie.php">Tina Opie, a management professor and organizational-behavior specialist at Babson College.