If you are operating a motor vehicle, you are required to hold a license to operate that vehicle. Ergo, if you are operating the vehicle, the police can ask for proof of your licensure to operate that vehicle, and you are reauired to produce it. That is not covered under search and seizure.
There is a three-song version of this by Howard Keel that you should really listen to.
The Man of La Mancha Dulcinea Dream the Impossible Dream