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Attorneys are calling for a mistrial because they weren't notified of the connection sooner. let's bring in nbc's pete williams. an interesting development to say the least in this trial. what do the new filings tell us about mateen's father sadiq and what could it mean for the course of this trial? >> what you said, that he was an informant from january 2005 until june of 2016. the fbi says that after the shooting agents searched the father's house and found receipts for transfers of money to turkey and afghanistan and then decided to open an investigation on him. so what the defense lawyers ...

Able to buy the 45 caliber gun used in the slaughter. that admission coming from fbi director james comy who told reporters his bureau made a mistake during dylann roof's background check and he says that rips all of our hearts out. according to law enforcement days after the shooting agents on the ground new something was amiss and suspected that roof's arrest record should have prohibited the gun purchase. >> it just shows how a bureaucratic mistake can cost human life. >> reporter: they didn't discover roof had previously admitted to illegally possessing drugs when he was arrested in late f...

Within days after the shooting agents on the ground knew something was amiss and suspected that roof's arrest record should have prohibited the gun purchase. >> it just shows how a bureaucratic mistake can cost human life. >> director comey says the fbi examiner during roof's background check didn't discover roof had previously admitted to illegally possessing drugs when he was arrested in late february. that information would have prevented roof from passing the background check. >> there's a regulation that says if he was a drug user he shouldn't have got a gun. there was abundant informatio...

Can't hold back the tears because it's like losing a son, it's like losing a nephew, and i truly felt like he was a true son of the united states of america and he was lost that night. >> at the scene of the shooting agents arrested a man and recovered three ak-47-type assault weapons. two were purchased in arizona by a man that was under surveillance as part of the fast and furious operation. he was arrested the next day. >> where did you first hear about it. >> on the media, newspapers. i never really got a call until it was brought out in the newspapers. i just was flabbergasted. i didn't b...

Can't hold back the tears because it's like losing a son, it's like losing a nephew, and i truly felt like he was a true son of the united states of america and he was lost that night. >> at the scene of the shooting agents arrested a man and recovered three ak-47-type assault weapons. two were purchased in arizona by a man that was under surveillance as part of the fast and furious operation. he was arrested the next day. >> where did you first hear about it. >> on the media, newspapers. i never really got a call until it was brought out in the newspapers. i just was flabbergasted. i didn't b...