Deal had been set to take the wraps off the new Georgia plate at the state Capitol Friday.
More than 500 design entries were submitted by the public. A panel of Georgia college and university art professors narrowed the selection to eight. An online public vote chose the final three designs.
But some of the designs presented online contained the motto "In God We Trust" while others did not.
The motto is actually an optional sticker that may be purchased for an additional dollar at county tag offices.
Deal said online voting will reopen Monday to choose the winning plate.