As POTUS, he couldn’t just deem something declassified. Congress and other
Government entities would need to be involved in order to do so. You have a kindergarten view of a President and classified material.
Most agencies inside the government who deal in high level information held back on giving sensitive information to trump because they viewed him as a high security risk.
Ehem!
You are really lousy at this.
Jack, he is a banker
and Jane, she is a clerk
and Jane, she is a clerk