There are laws against departing POTUSes taking secret documents with them.
Trump's argument: well I declassified all those documents so they weren't secret any more!
Now he either did declassify them or he didn't. If he didn't, he has a big problem!
But, notwithstanding that, should he have been allowed to declassify those secret documents? It sounds a bit of an easy workaround to the laws against a departing POTUS taking away secret documents!
And, more interestingly, why did he want those documents?