The government basically raises the bar when it provides this form of granularity. The federal government is a risk-averse enterprise when it comes to these matters, so nothing is put in the indictment unless it exists in actual fact.
The odds of beating this are very much against him, and he will probably continue to make the odds worse by running his mouth.
Trump’s insistence on keeping talking about this creates a record that would justify isolation in maximum security on the basis that “We can’t trust this man not to continue to talk. We can’t trust him not to further share these secrets with people who may wish to do harm with them. The only way to avoid that is to put him in isolation in supermax where he doesn’t get to talk with people, except under these extremely closely monitored circumstances, certainly isn’t in a general population situation, gets to take a walk in a courtyard for one hour out of the 24 hours of the day, and the other 23 hours, leaving him mostly without human contact.
He could possibly even talk himself into the El Chapo treatment.