National Security Advisor Michael Flynn arrives for a press conference between US President Donald Trump and Canadian Prime Minister Justin Trudeau in the East Room of the White House in Washington, DC, February 13, 2017.
The White House announced February 13, 2017 that Michael Flynn has resigned as President Donald Trump's national security advisor, amid escalating controversy over his contacts with Moscow. In his formal resignation letter, Flynn acknowledged that in the period leading up to Trump's inauguration: "I inadvertently briefed the vice president-elect and others with incomplete information regarding my phone calls with the Russian ambassador." / AFP / SAUL LOEB        (Photo credit should read SAUL LOEB/AFP/Getty Images)