The US Postal Service effort to develop a sweeping new system for verifying mail ballots has invited a host of IT concerns among agency officials, with some describing the process internally as a “sh*t show,” according to a new whistleblower report released Tuesday by a Democratic senator.

The unnamed whistleblower is alleging that some of the procedures USPS is planning – under mandates put forward by President Donald Trump – have been hidden from the public. Those procedures will make an already complicated and risky plan even more vulnerable to potential mass disenfranchisement, the whistleblower says.

The new report – which was assembled by the whistleblowers’ lawyers and released by Connecticut Sen. Richard Blumenthal – comes as multiple courts are considering the legality of the proposal, which would require that states submit to USPS lists of their mail-in voters. The agency will not deliver ballots for states if there are any discrepancies between the voter information in the USPS system and what’s picked up by agency scanners on the envelopes of the ballots.