A whistleblower for the U.S. Postal Service is warning that a new mail ballot system being hastily built to comply with President Donald Trump’s executive order restricting that method of voting could lead to the rejection of huge numbers of mail ballots. The whistleblower made the allegation anonymously in documents submitted by Democratic Sen. Richard Blumenthal to the Postal Service. Blumenthal says the disclosure shows Trump is trying to sabotage mail voting. A federal judge has barred the Postal Service from making the changes for the midterms, but that case is being appealed, possibly to the Supreme Court.