U.S. national security advisor Michael Flynn has resigned following widespread reports he had misled administration officials about his contacts with Russia.
In a resignation letter Flynn said he had inadvertently briefed then Vice President elect Mike Pence and others with incomplete information regarding his phone calls with the Russian ambassador to the United States.
Reports in the Washington Post and New York Times last Friday said Flynn had discussed with the ambassador the sanctions placed on Russia by the Obama administration, despite denials from the Trump administration that the talks dealt with that subject.
Several Democratic senators had called for an investigation of Flynn, while others urged Trump to fire him and for intelligence officials to review his security clearance.
Nine anonymous people described as current and former U.S. officials told the Post that Flynn and Russian Ambassador Sergey Kislyak explicitly discussed the sanctions placed on Russia by the Obama administration after the election hacking scandal.
The calls came at the same time as the Obama administration planned to roll out the sanctions, which raised suspicions by U.S. intelligence officials and initiated an investigation.