Derek Chauvin, a former Minneapolis police officer, was charged with murder and manslaughter after kneeling on the neck of a dying Floyd during an arrest last May.
"I've come to know George's family," including Floyd's daughter and brothers, Biden told reporters. "I can only imagine the pressure and anxiety they are feeling," he said, "and so I waited until the jury was sequestered and I called."
Biden said he would not have mentioned the call publicly if a family member had not made it public.
"They’re a good family, and they’re calling for peace and tranquility, no matter what that verdict is. I’m praying the verdict is the right verdict, which is - I think it’s overwhelming in my view. I wouldn't say that unless the jury was sequestered now, (would) not hear me say that."