Comment by pjc50

That would be truly exceptional, but: the US already is the only country that makes its citizens pay taxes when they're not resident at all. (Lots will make you pay taxes if you're partially resident)

They could quite easily take out anti-dual-taxation agreements and try to make US overseas nationals pay two sets of tax.

The existing regulations giving the US global jurisdiction over KYC/AML for Americans can also make it hard for Americans to get bank accounts overseas; that could easily be escalated.