The bombshell revelation raises serious questions about whether the FBI missed warning signs from his son leading up to the terrorist attack.
Salman is undergoing her own trial for obstruction of justice and aiding her husband in a terrorist attack at the nightclub.
In June 2016, Omar Mateen — Salman’s husband — killed 49 people and injured 58 others during his attack at the gay nightclub.
Both Salman and Mateen pledged allegiance to the Islamic State terrorist group prior to the attack.
“Seddique Mateen was an FBI confidential human source at various points in time between January 2005 and June 2016,” Salman’s lawyers said.
The defense said the new report offers two theories with the case: 1) Omar Mateen and his father, not Salman, conspired to support ISIS; or 2) the FBI focused on Salman as part of the case because the bureau wanted to avoid responsibility for failures regarding its own informant.
It’s unclear what the FBI used Mateen for specifically between 2005 and 2016.
Sweeney’s letter said authorities found receipts for money transfers to Afghanistan and Turkey while searching Seddique Mateen’s home in June 2016.
The money transfers took place just a few months prior to the terrorist attack at the nightclub.
The letter also revealed that the FBI received an anonymous tip in November 2012 that Mateen was working to raise $100,000 in donations to help a terror group carry out an attack against the Pakistan government.
Given the FBI was tipped off about Omar Mateen prior to the attack, Salman’s attorneys argue Seddique Mateen being an informant could have resulted in the bureau missing warning signs.
The new documents come after the FBI admitted it failed to respond to credible tips about the shooter in Parkland, Florida.
The bureau was warned numerous times that confessed gunman Nikolas Cruz was planning to carry out an attack.
A month after one of the tips, Cruz killed 17 innocent people at the Marjory Stoneman Douglas High School in February.
Serious questions continue to arise about why the FBI is allowing threats to slip through the cracks.