By Madeleine May Investigative Producer Madeleine May is an investigative producer at CBS News based in Washington, D.C. She previously covered politics for VICE News and reported on organized crime and corruption for OCCRP. She covers threats to democracy, disinformation, political violence, and extremism. Read Full Bio Updated on: September 1, 2026 / 10:19 AM EDT / CBS News Add CBS News on Google Washington — A whistleblower is warning of "potentially catastrophic problems" with the U.S. Postal Service's new system for handling mail ballots. The whistleblower is accusing the agency of flouting court rulings by continuing to work on implementing a Trump executive order to tighten mail voting rules before the November midterm elections. Described by lawyers as a federal official, the anonymous whistleblower revealed the information about the Postal Service's mail-voting procedures in a disclosure provided to Democratic Sen. Richard Blumenthal of Connecticut that was made public Tuesday.…