She is charged with obstruction and providing material support to a terrorist organization.
She's also been accused of telling Mateen to say he was out with his friend, should his parents ask about his whereabouts.
'It's a disgusting, random, senseless killing by a monster, ' Swift said. Specifically, they questioned whether the father had foreknowledge of Omar Mateen's attack and whether he "played a significant role" in the FBI's decisions to drop its investigations of his son in 2013 and 2014.
Defense attorneys argued that this evidence - which they say must be disclosed if it could impact the case, citing legal precedent - would have substantially changed their arguments in court. She faces life in prison if she's convicted.
Government prosecutors, then defense attorneys, will give closing statements starting Wednesday morning in the federal trial of Noor Salman, the 31-year-old mother accused of aiding her husband in the June 2016 Pulse nightclub attack.
The FBI also said it had received a tip that Seddique Mateen was engaged in fund-raising that may have been meant to contribute to "an attack against the government of Pakistan". "I don't know why he did it", he told NBC News at the time.
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Very little is known about an investigation of the Pulse gunman's father.
Defense lawyers have portrayed Salman as an unintelligent, naive woman who was married to a controlling and abusive husband. Security footage shows he went to Downtown Disney in Orlando before heading to Pulse.
The Orlando nightclub shooter meant to attack Disney World's shopping and entertainment complex by hiding a gun in a stroller but became spooked by police and instead chose the gay club as his target, prosecutors said Wednesday. Mateen killed 49 people in 2016.
The FBI also investigated the elder Mateen for money transfers to Turkey and Pakistan, which officials reportedly believed were to help fund "an attack against the government of Pakistan".
This email was sent after jurors heard Shahla Mateen, Omar's mother, deny during cross-examination that her husband had any relationship with the Federal Bureau of Investigation. But none of that came up in trial, where defense said the theory Mateen targeted gay people should not be allowed in court. They have argued at trial that it was coerced. The attorneys argued that the case should be dismissed or declared a mistrial because prosecutors waited until Saturday - days after prosecution rested its case and almost two weeks after the trial began - to acknowledge the shared history between Seddique Mateen and federal law enforcement.
Salman did not testify in her trial. That Salman could not plan for an attack because she was simple and has a low IQ, for example, should mean nothing to jurors, she says, "Helping you husband in a mass murder is not something you have to be a genius to say no to", Sweeney said, while referring to Salman as cold, callous and caring for no one else, except maybe her son.