US senator says that project, a key part of Trump’s voting restrictions, is ‘perilously rushed and potentially unlawful’A new system to screen millions of mail-in ballots for this November’s US midterm elections was thrown together so hastily, and tested so little, that a single scanning glitch could see entire batches of ballots turned away, a whistleblower has told Congress.The project – a key part of Donald Trump’s new restrictions on voting – is “perilously rushed and potenti