Guaido's ambassador to U.S. on humanitarian aid crisis in Venezuela
Venezuelan President Nicolas Maduro is blocking live-saving humanitarian aid from getting into his collapsing country. At least 47 countries, including the U.S., have recognized opposition leader Juan Guaido as the country's interim president. CBS News State Department reporter Christina Ruffini joins CBSN after interviewing Guaido's ambassador to the U.S. about the escalating tensions.