A conservative legal watchdog’s interviews with current and former aides 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 about her use of a private email server while serving as secretary of State will begin Wednesday and stretch into late June, the group announced.

The first person to be deposed as part of a court case concerning Clinton’s bespoke email setup is Lewis Lukens, a former executive director of the State Department’s executive secretariat, Judicial Watch said in a court filing Tuesday.

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Sworn testimony with Cheryl Mills, Clinton’s former chief of staff, is set to follow and has been scheduled for next Friday.

In subsequent weeks, the watchdog group will question former department executive secretary Stephen Mull, IT expert Bryan Pagliano, an official representative from the State Department, longtime Clinton adviser Huma Abedin, and sitting Undersecretary for Management Patrick Kennedy.

Kennedy’s interview, scheduled for June 29, is slated to be the final interview as part of the Freedom of Information Act case.

Each interview could last for as long as seven hours, Judicial Watch predicted.

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. The twin court cases were launched to obtain separate documents from Clinton’s time in office but have evolved as judges have raised questions about whether the likely Democratic presidential nominee’s arrangement allowed her to circumvent open records laws.

“This court-ordered testimony could finally reveal new truths about how Hillary Clinton and the Obama State Department subverted the Freedom of the Information Act,” Tom Fitton, Judicial Watch’s president, said in a statement Tuesday.

In addition to the officials scheduled to testify as part of the Judicial Watch lawsuit, Judge Emmet Sullivan has said that Clinton herself could be forced to answer questions under oath, depending on information learned through other interviews.

In the second Freedom of Information Act case launched by Judicial Watch, the organization has asked a federal judge to interview Clinton about her email setup. The request would have to be approved by the judge and is likely to face opposition from the State Department.

If it is granted, Clinton’s testimony has the potential to dramatically upend the presidential race, given the simmering concern about her email practices while in office.

Clinton and her campaign have dismissed concerns about the setup, claiming that it was used merely for convenience and that all work-related emails have been handed back to the State Department for record keeping.