A former aide to Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE testified on Wednesday about the Democratic presidential candidate's use of a private email server while serving as secretary of State, The New York Times reported.

Lewis Lukens testified under oath on Wednesday for two hours behind closed doors.

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Lukens, a former executive director of the State Department's executive secretariat, was the first person to be deposed as part of a court case concerning Clinton's email setup.

He testified as part of a lawsuit by conservative legal advocacy group Judicial Watch.

Other officials that will testify in the lawsuit include Cheryl Mills and Huma Abedin, both Clinton's top aides at the State Department.

The depositions are scheduled to run until June 29, just under a month before the start of the Democratic National Convention.

Each interview could last as long as seven hours. The depositions are the first of two separate court-ordered processes for Judicial Watch to obtain evidence as part of different open records cases concerning Clinton’s email setup.