Bidenator

We know that is not possible because...obviously.

Not according to Trump.

I guess not so obvious. Because he's lost his mind.

Yeap he did.
After all he still cries he is the president as he watches fox from Mar a Lago.

With Obamas' mind maybe, since he had the only authority over the Executive Branch of Gov't at the time that Biden as Vice President, somehow got classified documents past anyone. The classified docs he took as U.S. Senator, well, that's on him for stealing them without approval

Trump's statement has no limitations.
He is president, he can declassify whatever he wants with his mind as long as he is in office.