State decides to proceed hours after Trump administration asks supreme court to let it carry out proposed crackdown

North Carolina became the first state to start sending out mail-in ballots for November’s US midterm elections on Friday, as Donald Trump’s administration fights to impose sweeping restrictions on the practice before millions of Americans cast their votes.

The state’s decision to proceed – hours after Trump’s officials asked the supreme court to let the administration press ahead with its proposed crackdown – comes amid deep uncertainty over whether new federal rules governing mail ballots will be allowed to take effect, and whether the US Postal Service can implement the changes in time.

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 potentially unlawful”, according to the US senator Richard Blumenthal, who disclosed the warning in a letter to David Steiner, the postmaster general, on Tuesday.