(iii) Proposed provisions specifying that the USPS shall not transmit mail-in or absentee ballots from any individual unless those individuals have been enrolled on a State-specific list described in subsection (b)(iv) of this section with the USPS pursuant to this subsection.
They’re following the Hungary model, which in turn was a variation on the Russian model.
What they’re attempting is a “legal coup,” which is the typical modern democracy-to-authoritarianism transition. They want to retain the facade of constitutionality and lawfulness, to avoid creating an armed insurgency situation, and to avoid burning the value of the current economic system by crashing the stock market or causing investment to flee.