have you guys seen this?
"Following a catastrophic national emergency, the President, or his successor can authorize the establishment of a temporary "shadow government" to maintain control of the essential functions of the Federal Government. President Bush activated the shadow government on September 11, 2001 shortly after the second attack on the World Trade Center"
https://whitehouse.gov1.info/continuity-plan/I don't know that I've seen that exact thing, however, I have read quite a bit here and there about continuity of government plans-Dick Cheney had a big part in developing them IIRC.
I have been searching for the cold war era plans to avoid a Manchurian candidate. So far not much found.