He wants a deal. To get one, he’d have to hand over some of the information, then have what was handed over verified as true.
Don’t hold your breath on this one.
While much of what he has released over the years has been unfortunately damaging to the US, it's never been proven to be incorrect, and is generally accepted as 100% genuine. My guess is that would be the case here once again, and this country desperately needs to know the truth, for a variety of reasons.