A proposed USPS requirement linking ballot delivery to state voter lists raises questions about agency authority, legal exposure and operational feasibility ahead of a high-volume election cycle.

Postmaster General David Steiner says the USPS won’t deliver ballots if states don’t hand over their voter lists to Trump.

U.S. Postmaster General David Steiner defended a controversial proposal backed by US President Donald Trump that would require states to provide lists of voters who received mail…