Huma Abedin, vice chair of Hillary Clinton's presidential campaign, is testifying today about her knowledge of her boss's private email system while at the State Department.

Abedin is just the latest aide to testify as part of a Freedom of Information Act lawsuit launched by the conservative group Judicial Watch, which has been trying to get access to Clinton's emails during the presidential candidate's tenure as secretary of state.

The group is interested in finding material about Abedin's 'controversial employment status,' in which the longtime Clinton aide was able to maintain a job at the State Department as a 'special government employee,' while simultaneously working for outside consulting firm Teneo.

Patrick Kennedy, another top State Department staffer under Clinton, is slated to testify tomorrow.

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Top Clinton aide Huma Abedin testified today in the Freedom of Information Act case brought by conservative watchdog group Judicial Watch

Huma Abedin's 'controversial employment status' is central to the Freedom of Information Act case, with the group Judicial Watch asking a judge to reopen it after Hillary Clinton's secret server was discovered

In March 2015, Judicial Watch asked that a previous Freedom of Information Act lawsuit be reopened in light of the discovery that Clinton and other aides used private email accounts.

'Hillary Clinton's misconduct and the resulting fraud by the State Department disrupted and ended our federal FOIA lawsuit about Huma Abedin, one of Hillary Clinton's closest political associations,' Judicial Watch President Tom Fitton said at the time.

'Hillary Clinton and the Obama administration concealed records and lied to obstruct a federal court and Judicial Watch from finding out about the secret emails,' Fitton continued.

'Time is of the essence. Immediate court action is imperative to retrieve, recover and secure these public records from Mrs. Clinton.'

The following February U.S. District Judge Emmet G. Sullivan granted the conservative watchdog group the right to question under oath the former secretary of state's closest aides, including Abedin, who's central t the case.

He also opened the door to Clinton being interrogated herself.

'There's been a constant drip, drip, drip of declarations. When does it stop?' Sullivan said. 'This case is about the public's right to know,' added the judge, who was appointed by Clinton's husband President Bill Clinton.

By mid-May Judicial Watch and the Department of State had agreed upon a discovery plan with a number of high-level Clinton aides to be questioned under oath.

Huma Abedin, a longtime Hillary Clinton aide, will take questions today from Judicial Watch attorneys, following in the footsteps of IT staffer Bryan Pagliano and Clinton's former chief of staff Cheryl Mills

Huma Abedin (left) had a special employment arrangement at the State Department, as she was allowed to work at outside firm Teneo, while also retaining her State gig with Hillary Clinton (right)

Most recently, IT staffer Bryan Pagliano declined to answer questions posed by the group's lawyers.

He invoked the Fifth Amendment 125 different, consecutive times, according to CNN.

Pagliano is the staffer that the Justice Department gave immunity to in order to get information about the email system in a separate federal probe.

Clinton's former chief of staff Cheryl Mills also testified, but because she acted as Clinton's counsel after her State Department role, Mills lawyer could use attorney-client privilege to get the aide out of answering some of the questions.

'I know I spoke with Mr. Pagliano about the setup of the server during the period in which I was representing Secretary Clinton, which would have been two thousand – which would have been post her departure from the State Department,' Mills offered during her testimony.

'At least that's my best recollection,' she added.

When Judicial Watch's attorney Ramona Cotca followed up and asked Mills if Pagliano was working for the Clintons at the time that they spoke, Mills' attorney Beth Wilkinson cut in with an objection.

'I'm representing Ms. Mills, as we know, and she represents Hillary Clinton as her personal lawyer,' Wilkinson argued. 'And you are now asking about work she has done for Hillary Clinton as her lawyer.'

'And it is beyond the scope of permissible discovery, and so I am instructing her not to answer,' Wilkinson said.

As the court case has moved slowly along, some of the Clinton emails have shed light on Abedin's unique employment set-up.

In September, in emails dredged up by Judicial Watch's suit, Abedin is shown having months-long exchanges with State Department employees as she seemingly dragged her feet on providing additional information about her husband's job and wealth.

Abedin is married to disgraced Democratic ex-congressman Anthony Weiner, whose two sexting scandals derailed his time in Congress and then his underdog attempt to run for New York City mayor.

The emails showed that there was 'a rush,' according to Judicial Watch, to appoint Abedin to this special position, which allowed her to work as both a State Department employee and as an outside consultant.

The company for which she would be working, Teneo, had a cozy relationship with the Clintons.

Abedin was also working for the Clinton Foundation as well.

When she was approved for 'special government employee' status she still hasn't disclosed Weiner's financial information, despite repeated requests by State Department employees at the time..

'These documents show the Huma Abedin received special treatment contrary to law and that Hillary Clinton personally approved a corrupt patronage position,' said Fitton.