Disclosing or misusing classified information for profit is, as Mr. Alexander well knows, a felony. I question how Mr. Alexander can provide any of the services he is offering unless he discloses or misuses classified information, including extremely sensitive sources and methods. Without the classified information that he acquired in his former position, he literally would have nothing to offer to you.
Following a link, below is a screen capture of that letter as posted online here, which readers can click to enlarge and read:
Grayson asks the intriguing question, what offer has this man made to you that you cannot refuse? Something like that. Close enough.