LAWYERS for the widow of the Pulse nightclub shooter in Florida called for a mistrial on Monday after they were told that the attacker’s father was an FBI informant for 11 years, according to reports.

Noor Salman is accused of helping her husband, Omar Mateen, plan the June 12, 2016, attack on the gay club in Orlando, where he slaughtered 49 people and injured 68 others before being shot dead.

According to the New York Post, her lawyers’ federal court motion filed on Monday says that prosecutors contacted them on Saturday night and told them about Seddique Mateen’s relationship with the FBI, the Orlando Sentinel reported.

“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,” lawyer Fritz Scheller said in the court filing.

The motion was filed just hours before Salman’s lawyers were slated to begin presenting their case. The prosecution rested its case Thursday.

According to the New York Post, her lawyers’ federal court motion filed on Monday says that prosecutors contacted them on Saturday night and told them about Seddique Mateen’s relationship with the FBI, the Orlando Sentinel reported.

“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,” lawyer Fritz Scheller said in the court filing.

The motion was filed just hours before Salman’s lawyers were slated to begin presenting their case. The prosecution rested its case Thursday.

That would be relevant to Ms Salman’s defence, Mr Scheller argued, because the government has claimed she helped her husband invent a cover story to tell his parents about where he was going the night prior to the mass shooting.

If Seddique Mateen had “some level of foreknowledge” about his son’s plot, a cover story “would have been completely unnecessary,” according to the motion.

According to the motion, CBS News reported, the defence also alleged that a decision not to give Ms Salman a polygraph was possibly “based on the FBI’s desire to implicate Noor Salman, rather than Seddique Mateen in order to avoid scrutiny of its own ineptitude with the latter.”

Prosecutor Sara Sweeney disclosed the information about Seddique Mateen to the defence in an email on Sunday. Salman’s attorneys said prosecutors violated an evidence disclosure law by not informing them sooner.

Salman, 31, is accused of obstruction of justice and aiding and abetting her husband’s providing material support to a foreign terrorism group.

Her attorneys have said they plan to tell jurors that Salman was diagnosed with post-traumatic stress disorder because of Mateen’s domestic abuse.

Defence lawyer Linda Moreno said in opening statements that Salman is a “trusting, simple” person who did not know she would be widowed because her husband became “a martyr for a cause that she didn’t support.”

Last week, US District Judge Paul Byron told jurors they could expect closing arguments on Wednesday, which means a verdict could come by the end of the week.