National security adviser Michael Flynn resigned following reports he misled Vice President Mike Pence about contacts with a Russian diplomat, up-ending President Donald Trump’s White House team less than a month since his inauguration. In a resignation letter, Flynn said he gave Pence and others “incomplete information” about his calls with Russia’s ambassador to the U.S. The vice president, apparently relying on information from Flynn, initially said the national security adviser had not discussed sanctions with the Russian envoy, though Flynn later conceded the issue may have come up.