President Donald Trump's embattled national security adviser Michael Flynn resigned late Monday night, following reports that he had misled Vice President Mike Pence and other officials about his contacts with Russia.
Mr Flynn's departure less than one month into the Trump administration marks an extraordinarily early shakeup in the US President's senior team of advisers.
In his resignation letter, Mr Flynn said he held numerous calls with the Russian ambassador during the transition and gave "incomplete information" about those discussions to Vice-President Mike Pence.