The father of the Pulse nightclub shooter served as an FBI informant for 11 years, according to a federal court motion, obtained by multiple outlets.

Lawyers for Omar Mateen's widow, Noor Salman, filed a federal court motion on Monday saying that prosecutors contacted them on Saturday, saying Mateen's father Seddique Mateen worked as an FBI source from 2005 to June 2016.

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Salman is accused of aiding her husband in the attack on the Orlando, Fla., nightclub in June 2016, which left 49 people dead and numerous others injured.

She has pleaded not guilty to providing support for a foreign terrorist organization and obstruction of justice.

Salman's lawyers said they would have presented two theories if they had known about Mateen's prior work.

"1) Omar Mateen and his father, rather than Ms. Salman, conspired to support [the Islamic State in Iraq and Syria]; or 2) the FBI's focus on Ms. Salman was based on its own motive to avoid responsibility for its failures with its own informant, Seddique Mateen, as well as his son," the attorneys said, according to CNN.

Her lawyers have called for a mistrial after they said they received the information on Saturday night.

"It is apparent from the Government's belated disclosure that Ms. Salman has been defending a case without a complete set of facts and evidence that the Government was required to disclose," her attorneys said in the motion, according to the network.