Recent declaration: https://www.dhs.gov/sites/default/files/publications/mgmt/human-resources/mgmt-dir_252-16-order-ceremonial-precedence-dhs-positions_rev-00.pdf
here’s an earlier this year opinion
https://llb2.com/2019/04/10/acting-dhs-secretary-appointment-violates-dhs-succession-act/
then there’s an Obama modification of an E.O. changing order of succession as such:
I believe the Pres. has successfully challenged this type of thing before (Dana Boente for one) under this:
Thanks, I read the first two and then stopped. I am not enough of a lawyer to understand what it means legally with respect to the president making an appointment. You seem to think POTUS has legal precedent for doing this before, so I guess I am happy to see it play out.