Gov. Phil Murphy says that he has reservations about the state issuing a COVID-19 vaccine passport.

The governor’s comments come a day after the Biden administration said that the president does not support a vaccine passport.

Murphy says that he hasn’t completely ruled out the idea, but that he has concerns.

“I’ve been open minded to it. But I worry about the inequities that brings, frankly,” Murphy said. “I think you’ve got to be careful about this. So I’m open-minded…It’s not a dead letter for me, but I think we have to be very careful in terms of how we think about it.”

New York state launched its Excelsior Pass late last month. New York Gov. Andrew Cuomo called the passport app “innovative.”

Murphy and first lady Tammy Murphy will be receiving their COVID-19 vaccine dose on Friday in Atlantic City.