If Biden is not the ultimate command over the nucs…who is?
DJT is CIC.
Search for a clip from DJT's trip about 2-3 weeks ago to Manchester NH. In it, there is a presidential SUV with hardened double rear hatch, and the clip seems intended to show without saying it: some guy carrying what appears to be the nuclear football briefcase.
For further research, check out Continuance of Government (COG) and Devolution.