Someone asked last bread if POTUS would be allowed to provide classified information in his defense if he is impeached. This question shows a fundamental misunderstanding about classifications and clearances. One thing everyone should know is that classifications and clearances originate with the President. He is the one that defines classifications and clearances, determines what will and will not be classified, and has the ultimate authority in classifying and declassifying anything. He holds no clearances because he doesn't need them. He is the ultimate authority in who may or may not hold a clearance and he is the one that can revoke anyone's clearance.

https://news.clearancejobs.com/2016/07/25/kind-security-clearance-president-get/