The Flint, Michigan water crisis forces an official with the Environmental Protection Agency to resign. The E.P.A. also announces it will take over lead sampling of the city’s water. While a federal appeals court hands President Obama a temporary win on a key rule to limit carbon emissions, the Supreme Court agrees to review a case challenging his executive actions on immigration. Ted Cruz accuses the Republican establishment of unifying behind Donald Trump. On the Democratic side, a surging Bernie Sanders prepares to challenge Hillary Clinton on Super Tuesday and beyond. And people living on the east coast of the U.S. prepare for a monster snowstorm. A panel of journalists joins guest host Susan Page for analysis of the week’s top national news stories.