(CNN) A judge has denied a motion for dismissal by lawyers for the widow of the Pulse gunman after they said new details from prosecutors reveal the shooter's father was an FBI informant who is currently under a criminal investigation.

The judge said the fact that Omar Mateen's father worked as an FBI informant was not relevant to the case against Noor Salman.

According to a motion filed by the defense, Assistant US Attorney Sara Sweeney sent an email to the defense on Saturday -- in the middle of Salman's trial -- that stated Seddique Mateen was a confidential FBI source at various points in time between January 2005 through June 2016.

The email also stated that Seddique Mateen is being investigated for money transfers to Turkey and Afghanistan after documents were found in his home on June 12, 2016, the day of the Pulse attack. The dates of the money transfers were between March 16, 2016, and June 5, 2016, according to the email.

The revelation threatened to upend the case against Salman , the wife of Omar Mateen who is on trial for charges related to the mass shooting at the Pulse nightclub in Orlando, Florida in June 2016. Salman's defense attorneys said the failure to disclose this information earlier violated her due process rights, and they argued they would have taken a different legal strategy if they had known about this earlier.

Read More