first we want to talk to our justice correspondent pamela brown. >> this shows a huge breakdown in the background system which is run by the fbi, fbi director comey admitting a series of errors enables roof to buy the gun that killed those churchgoers. the man who confessed to gunning down nine people inside a south carolina church should never have been able to buy the the .45-caliber gun he used to kill them. that bombshell coming from fbi director james comey, who told reporters in a closed-door session his bureau made a mistake during dylann roof's background check, a mistake he saidwas "of heartbreaking importance that rips all of our hearts out." >> it shows how a bureaucratic mistake can affect life. >> reporter: the background checker said roof admitted to