The head of security was under increasing scrutiny for failing to have an agent stationed on the roof from where.
The assassins fired on the former president, and for allowing Trump to enter the stage despite the danger being reported.
A person of questionable character had been named only hours before to the shooting.
He managed to fire a barrage of shots into the audience before a sniper shot him dead.
According to Wray, the criminal involved climbed onto the roof of a small factory that was within 135 meters (157 yards) of the stage using ground.
level mechanical equipment and vertical pipes. His death came after he had fired eight rounds from an assault weapon.
