"I took a risk, a chance ... and they work really, really well."

EXCLUSIVE: President Trump on the success of Operation Warp Speed

"I took a risk, a chance, but I felt it was going to be good, I felt it was going to work -- and they did work, and they work really, really well."

Watch his interview with Steve Gruber on America's Voice Live: https://bit.ly/3kqiwCf