Senior politics reporter Jane Coaston joins Dara and Matt to talk about the ideological roots of Donald Trump's family separation policy.References and further reading:Dara's piece on "operation wetback" the immigration policy Donald Trump loves Jane's piece on Stephen Miller Jamelle Bouie's piece on Stephen Miller Politico piece about Trump possibly shutting down the government in September over border wall, mentioned by Jane Dara's piece on the number of families separated at the border daily Dara's piece on how asylum officers are being told to implement Sessions' new rule

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