BERMAN: All right, more breaking news now. Bernie Sanders, the Sanders campaign, is confirming the 2020 Democratic contenders suffered a heart attack earlier this week. Sanders left the Las Vegas hospital earlier today after he had two stents placed in a blocked artery. In a tweet posted moments ago, Sanders says he's feeling so much better and add he'll see everyone soon on the campaign trail. We will all welcome him back. All right, I want to bring in Chris Cuomo to see what he's working on for "Cuomo Prime Time" at the top of the hour. Chris?</s>CHRIS CUOMO, CNN HOST: Obviously the biggest concern with the senator is his health and his quick recovery. He looked good. His wife says he's good. God bless him. Good luck going forward. We look forward to seeing him back out on the trail. Just big news just now, "The New York Times" is saying there may be another whistleblower. And this one had more firsthand access or understanding of what was going on than the whistleblower we know now from the intelligence community. Now, I don't know why you need another one, now that you have Volker. To your earlier point you were making with your guest, you got the text, you got Volker, there's nothing anonymous about it, but this is what happens when you deny the obvious, John, it keeps coming at you.</s>BERMAN: That's right, the evidence is there, but who knows what this other person has to say. Chris, we're digging on that also. See you in a few minutes. Just ahead, whistleblowers who have changed the course of history, stick around.
Doctors: Bernie Sanders Suffered A Heart Attack