Schiff believes that he is a legendary super-hero who can hide embarrassing details behind the National Security blanket. Well he needs to remember that he is not in a position to decide what is a national security issue, the gentleman who is being accused of bullshit and who is still THE PRESIDENT, is the person who owns all Federal data and who can classify any of it exactly as he chooses. Schiff's documentation is part of the Federal Record, a record of government workings, it is not his private or personal information. I am sure that it will be revealed, when it suits POTUS and his team and at a time when it will most benefit the accused. Edit:  It may be prudent for a preservation order to be issued, that prevents the destruction of any evidence collected during the House circus.