Except that's a political nonstarter in the US. The military has a 2FA smartcard authentication system that works really well, so it's not like it's infeasible.

Except that's a political nonstarter in the US. The military has a 2FA smartcard authentication system that works really well, so it's not like it's infeasible. A number of of very different groups are very opposed to the very idea: libertarians, (some) Christians, and (many) civil rights activist being the most vocal.