President Donald Trump's former national security adviser, Michael Flynn, pleaded guilty Friday to "willfully and knowingly" lying to the FBI in Special Counsel Robert Mueller's investigation into possible Russian interference in the 2016 election.

Flynn lied to investigators in January about conversations he had in December 2016 with Russia’s ambassador to the U.S., Sergey Kislyak, according to court documents released Friday.

Read the document released Friday:

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Near the end of the longest day of the year, Georgians rest atop Stone Mountain to watch the sunset behind the Atlanta skyline. (Richard Watkins/AJC)

Credit: Richard Watkins