John Solomon of Just the News has the memos showing Trump ordered the materials in question declassified while he was POTUS. Official records exist also.
So it looks like the Dems intend to trip him up by nailing him with possession of classified documents he thought were legally declassified.
I just caught John Solomon on Hannity and his explaination of Trump's "standing order" was pretty sketchy. He claimed Trump's standing order was that anything he removed from the White House was "automatically declassified". Obviously, that's ridiculous. You don't declassify documents that remain critically sensitive just because you want to take them home. That's banana republic level stuff, and I doubt Trump would operate that way.