The U.S. Postal Service unveiled a proposal to ban mail ballots in states that refuse to share voter data, a move Democrats and civil‑rights groups deem a federal overreach that could bar millions of voters.

The rule targets states lacking data transparency, tightening federal oversight on election logistics. Critics argue the measure undermines mail‑in voting, a critical channel for remote and underserved voters.

Businesses that rely on mail services, from political campaigns to consumer firms, face higher uncertainty. Postal contractors and election technology vendors may see demand shifts as states reassess ballot handling under the new rule.

The proposal ignites a legal battle that could reshape election administration and affect voter turnout across the country.