High ranking retired officials who have a clearance apparently get it periodically renewed automatically. So former Presidents get routine briefings to remain "in the know". Both political parties are fine with this arrangement for the same reasons. However, most officials lose their clearance when it times out. As I posted above, deliberately removing clearances from certain retired officials was immediately labeled by one political faction as tyrannical and paranoid, even treasonous. Obviously, these officials are not receiving briefings from the current administration, but they still can get classified information from former co-workers who are not violating their own security clearance by doing so. The Government cannot restrict free speech, but this does not extend to national intelligence. If you want to know something like that, then fill out a FOIA request. So, persons who soon may find themselves the subject of investigation should no longer have access to Departments that may be tasked to do the investigating.
Astrologers believe that your future is determined on the day that you are born.
Warriors know that your future is determined on the day that your enemy dies.