Yes the president has a clearance. It is called need to know clearance and it is a clearance only the president has. Basically it tells that he needs to know everything (which he does). It is also the highest clearance in the United States. Well the world really he knows everything about every country at every giving day or if something comes up that may need more attention. Does that say he knows every secret America has ever hide or is hiding right now f course not. But, what gets a lot of generals out of trouble is quote "plausible deniability". Even though the president is not subjected to any classification secrets sometimes generals dont tell him everything. The president can walk in any DoD, government, and congressional meeting he wants to and he off he is not subjected to dismiss his security and communication abilities. Sounds cool but, the downside of this is he cannot have a secret meeting with a subjected party or organisation, meaning the meeting must either be documented by congress and have some other reference of accountability (like secret service, or an opposing comity) something that can be subjected to review if the case arises.