With immigration challenge, Castro brothers shake up Democratic battle

Twin brothers Joaquin and Julian Castro are shaking up US presidential politics by forcing attention on the desperate situation of migrants, one as a congressman and the other the sole Latino seeking the Democratic White House nomination.With Democrats generally backfooted by President Donald Trump's tough crackdown on undocumented migrants, the Castros stole the spotlight in recent days by highlighting the mistreatment of border-crossers and offering concrete ideas to face the crisis in a more