Pfizer and BioNTech last week asked the FDA to expand the use of their COVID-19 vaccine. On Friday, the agency is expected to tell us if the vaccine works in children under 5. As the world awaits Russia's next move in Ukraine, President Biden wants Americans to leave the country. But thousands of Americans call Ukraine home. And truckers in Canada are cutting off U.S. border crossings as some demand the dissolution of the government.