[ConservativeDude]

no possible under common law, and that is where Blackstone is an authority.

but methinks possible under applicable statutory law which does create dual citizens of many countries....Certainly Blackstone is generally correct, but if statutory laws intervene, then that can be an exception to the general principles of common law....to be continued.

[RC one]

if statutory laws intervene, then that can be an exception to the general principles of common law.

I would argue that no simple law can act upon article II, section I, clause 5 however.