Democratic presidential candidate Julian Castro accused President Donald Trump of running a "shadow government" in an interview with Wolf Blitzer on Saturday. "It is amazing what is emerging in terms of the scope of what happened between Donald Trump and the Ukraine and the way he's been trying to get a country like Ukraine to do his political dirty work and rthe involvement of Rudy Giuliani, someone who doesn't have security clearance that ought to be required to do that kind of work, this rogue operation as the 'New York Times' has said to set up a shadow government, shadow dealings with Ukraine. There's a lot here," Castro said on CNN.