presidential power

An unsealed letter from a Trump attorney asserts that a president has absolute authority to declassify whatever he wants — and that the “primary” law governing the handling of classified information doesn’t apply to the president.
The president was roasted for wanting both total authority and zero responsibility.
Obamacare repeal is dead (for now). His party doesn't trust him. He has no major legislative accomplishments. What happened to the art of the deal?