Explainer: Venezuela crisis puts Trump policy to the test

In its biggest political and diplomatic intervention in Latin America in years, the U.S. government has rolled out waves of punitive measures against Venezuela, including several rounds of sanctions on its leadership, vital oil sector and banks.With fewer levers left to pull and protests apparently petering out on Wednesday, President Donald Trump could suffer a setback if Guaido's latest push fails to ignite a broader uprising against Maduro.Hawkish national security adviser John Bolton and oth