BERMAN: Attorney General Loretta Lynch is expected to meet with survivors of the Orlando shooting and victims' families. She'll also meet with first responders and hear a briefing from investigators, who now have video of the shooter practicing with the Sig Sauer MCX rifle that he used in the attack on the Pulse nightclub.</s>BOLDUAN: Authorities say that staff at the Florida shooting range had to step in actually after seeing how the shooter handled the gun. CNN's justice correspondent, Evan Perez, is actually learning much more about this. Evan, what are you hearing?</s>EVAN PEREZ, CNN JUSTICE CORRESPONDENT: Well, Kate, the interrupt him because a lot of gun ranges, you know, they find that to be unsafe handling of firearms. So they corrected him. And after the shooting in Orlando they remembered that this was the guy, and they went back and found video of this and have now turned it over to the FBI. This was the Sig Sauer rifle, the rifle that he used in the Orlando shooting, and so this is all now part of this sprawling investigations. The FBI says they've talked to 500 witnesses, done 500 interviews and that's part of what the attorney general is doing down there is to come and get a briefing on what the U.S. attorney's office in Tampa has found so far. As you know, there's still a lot of focus on the wife and what she knew, whether or not there was anything she knew that could have prevented the attack, whether she should have called the authorities. We're told that that investigation is still ongoing. We don't expect it to wrap up anytime soon -- Guys.</s>BERMAN: Evan Perez, in Washington, thank you so much.</s>BOLDUAN: Any moment now, Hillary Clinton will attempt to deliver a major blow to Donald Trump's campaign. We know that she plans to take on and attack the presumptive Republican candidate on the economy and his business record. Will she be able to land a blow where Donald Trump is seen as strongest? We're going to bring you that speech as soon as it begins.
Gun Range Turns in Video of Orlando Shooter