Gordon D. Sondland, the United States ambassador to the European Union, has evolved from a loyal Trump campaign donor to a witness central to the impeachment inquiry. But his testimony has been contradicted on multiple occasions. Today, we look at how both Democrats and Republicans on the House Intelligence Committee handled their most complicated witness to date.  Guest: Nicholas Fandos, who covers Congress for The New York Times. For more information on today’s episode, visit nytimes.com/thedaily.  Background reading:Mr. Sondland implicated Secretary of State Mike Pompeo in the nation’s biggest foreign policy controversy in nearly two decades. Reciting emails that he had written to Mr. Pompeo, he said that “everyone was in the loop.”Confused about what this moment might mean? Here are answers to seven key questions about the impeachment process.