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Attorneys: Pulse Nightclub Shooter's Dad Was FBI Informant

ORLANDO, Fla. (CBSLA/CBS News) - Attorneys for the widow of Pulse nightclub gunman Omar Mateen are calling for a mistrial after they say prosecutors revealed that Mateen's father was an FBI informant.

CBS affiliate WKMG reports that prosecutors sent an email on Saturday that stated Seddique Mateen was a confidential FBI source from 2005 until 2016, according to a motion filed by the defense.

Omar Mateen's widow, Noor Salman, is on trial in federal court on charges of aiding and abetting her husband, obstruction of justice and lying to federal agents. If convicted, she could get life in prison.

Her husband killed 49 people and injured at least 68 others when he opened fire inside Pulse on June 12, 2016, before he was shot to death by police.

WKMG reports that the email sent by prosecutors stated that Seddique Mateen is also being investigated for money transfers to Turkey and Pakistan.

Omar Mateen's immigrant family lived the American dream - or so it seemed
Seddique Mateen addresses media from his home Monday morning, June 12, 2016 in Port St. Lucie, Fla. Seddique Mateen, the father of Orlando shooter Omar Mateen, insists his son was no Islamic radical and that he had no clue of his son's plot to murder dozens at an Orlando gay nightclub. (Lance Dixon/Miami Herald/TNS via Getty Images)

Salman's lawyers allege the new revelation prevented them from investigating whether or not Seddique Mateen knew of his son's plans to attack the nightclub.

According to the motion, defense lawyers allege that the decision not to give Noor 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."

"Mateen's father played a significant role in the FBI's decision not to seek an indictment from the Justice Department for false statements to the FBI or obstruction of justice against Omar Mateen" during its 2013 investigation into his alleged threats, the motion stated.

In the days following the Pulse shooting, three U.S. Congressmen - including two Southern California lawmakers - acknowledged meeting with Seddique Mateen but downplayed the encounters and described them as short and insignificant.

Rep. Ed Royce, (R-Fullerton) said he vaguely recalled a discussion about Afghanistan-Pakistan relations, but he described the meeting as "brief and inconsequential."

Dana Rohrabacher, (R-Costa Mesa) said Mateen "paid a visit" to his office in November 2014, but didn't recall any specifics.

Meanwhile, attorneys in federal court Monday will try to convince jurors that Salman didn't help her husband as he prepared for the attack on the gay nightclub.

Federal prosecutors rested their case Thursday. Mateen and his wife exchanged text messages during the attack, according to evidence presented to a jury.

"I love you babe," Mateen wrote in his last text message at 4:29 a.m.

© 2018 CBS Interactive Inc. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.

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