WATCH: MSNBC medical 'expert' is upset Biden isn't building a federal vaccine database

Dr. Zeke Emanuel spoke to NBC's Andrea Mitchell on Friday lamenting the lack of a national database of vaccinated Americans.

Mitchell asked Emanuel "How serious is this threat? Forged vaccination cards so people can go out and do what they want when they have not been vaxxed?"

"Yes, I think it's a serious threat, I think it's inevitable and I have been saying it for months that we will be certifying whether people have been vaccinated or not to go to indoor events like theater, or sporting events, or even airplanes, or return to employment.

"And I understand why the administration really didn't want to create a large database. I don't think privacy is really the concern, I think alot of people are really, what they're really worried about is things like exploitation, is it gonna be commercialized?

"Is it gonna fall into hands where people are gonna use it for other reasons than the reasons that they certify, and those are serious concerns, but so is forgery and I'm going to an indoor spot, everyone says they've been vaccinated, show their card, but in fact haven't, and a spreading event is possible.

"So there's no easy solution here, but I do think not doing a national database where, by the QR code, you can actually get in, having that done by a not-for-profit, making sure it won't be commercialized, I think that would have been the right way to go."

The concept of a vaccine passport or vaccine certification that can be used to gain access to those events that the CDC says are safe for vaccinated persons and not for others have been a source of controversy in the US.

While at first the Biden administration said they would be teaming with businesses to create a credential, they have since said that they would not be creating any kind of federal database for vaccinations.

New York Governor Andrew Cuomo enacted what has been termed the Excelsior Pass, which businesses can use to either grant or deny admission to events and venues based on a person's vaccine status. Chicago has also created their own version.