The President should not only deny security clearance to Brennan, Clapper, Hayden, Rice, Comey, McCabe but all former employees or the FBI, CIA or other governmental agencies that could access such classified work. What would such individuals need this information for if they are not currently using it for public service?  Once they have left their position by force or in good terms they would only use this information for their personal benefit  in the “private sector” and would reap a financial benefit for such access. A matter fact those employees who are under serious investigation should be denied this information as well unless it can be shown it will demonstrate their innocence. Classified Information must remain so to those entrusted by the public at large to keep it as an employee of said government.