For decades, Mexico grew accustomed to a constant stream of people leaving the country. But over the past 8 years, some 3 million Mexican adults living illegally in the United States have been deported, rapidly turning Mexico from a country of emigrants into a country of immigrants. We spend the day with disco queen and "I Will Survive" star Gloria Gaynor as she prepares for and performs a singular show in the iconic Great Hall at the U.S. Library of Congress. And, a look at the 18 days leading to Michael Flynn's resignation as national security advisor.