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Trump goes after Ted Cruz's citizenship
MSNBC Political Correspondent Steve Kornacki breaks down current poll numbers and explains Trump's citizenship attacks on Ted Cruz and whether casting doubt could lead to a legal challenge for Cruz.
Trump immigration ban draws global outcry04:22
Sen. Feinstein: We need 'independent' attorney general03:38
Report: Key leaders left out of ban talks06:07
New questions over deadly Yemen raid02:33
Ex-Mexican President: We're ready for trade war03:52
Mexico unites behind own president, against Trump07:33