Protesters chant 'Lock him up' at Flynn as he leaves courthouse

General Michael Flynn left the courthouse Friday to find a number of protesters

Flynn served as Trump’s first national security advisor and advised Trump on the campaign as early as January 2016. At one point, ABC News and other outlets reported Flynn was under consideration for vice president.

But less than a month after Flynn was named national security advisor, reports that Flynn lied about his conversations with the Russian ambassador ended his White House career.

When the subjects of the multiple conversations Flynn had with the ambassador were revealed, Trump asked for his resignation. Flynn gave it on Feb. 13.

ABC News' Alex Mallin, Jordyn Phelps and Megan Hughes contributed reporting.