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Humanitarian aid struggles to reach Venezuela as political crisis escalates

Venzuela is facing a dire humanitarian crisis as President Nicolas Maduro and U.S.-backed opposition leader Juan Guaidó vie for power. The United Nations believes more than 3 milliion refugees have fled the country. CBS News foreign correspondent Elizabeth Palmer reports on the situation in Caracas, and CBS News State Department reporter Christina Ruffini explains how the U.S. is helping.
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