No it isn’t -the law you just quoted.
Just cause you find a law that quotes something doesn’t mean that that is what originates that controlling power.
People get tripped up on this all the times.
The Constitution is the Controlling Law of the Land
Then comes statutes
And then various administrative stuff.
Congress all the times passes laws that put restrictions on presidential powers that are unconstitutional - if taken to the extreme.
The president doesn’t have to take them to court - as those laws are void ab ignitio. Typically presidents sign the law and issue signing statements saying what parts they think are unconstitutional - bush challenged over 1000 provisions - Obama over two dozen bills (more pro ions, but don’t have th count).
Anything under the executive branch is governed by the president PERIOD. While there are limits - and this is a huge topic - and it isn’t settled law.
and things from one administration don’t carry over to another. That is why stuff like a two-man rule is bullshit - as any new incoming president can simply rewrite that.
Same with stuff like filibusters - any new congress can’t be restrained by previous congresses rules - they start over from the begining.
The law you site is dealing with a criminal code for violations for disclosing classified information - it has absolutely zero to do with where the power to classify documents in first place comes from - despite the fact someone could read the definitions in there and conclude that it does. I get why people would think that, but that isn’t the way the law works.
Nothing trumps the constitution - mush about Cheneys seeming evilness was his true concern over the nature and power of the presidency. He was so concerned about this - that realizing the constitution didn’t have provisions in place - he was concerned that there would be a constitutional crisis if he was to go in a coma or something due to his heart problems - as there was nothing in the constitution to deal with that.
So he signed a letter of resignation - and placed in his safe that only his trusted secretary had access to.
Anyway - getting off tangent.
President doesn’t technically need a security clearance (but I’m sure he has one as it would break all sorts of databases if he didn’t) - and it’s good for morale.
Once both Donald and Hillary are their parties nominees - they both will receive an intelligence briefing.
Once one become president-elect they will get daily briefings - and no one will be checking their backgrounds.