Angela Rayner has called on the Prime Minister to release the full details of the investigation into Rishi Sunak.
After the Chancellor referred himself to the Prime Minister’s independent ministerial interests advisor, Lord Geidt, Ms Rayner claimed public confidence in the standards system is “at rock bottom”.
In the letter published on Twitter, the deputy leader of the Labour party demanded Mr Johnson set out a timeline for when the inquiry will conclude.
She added: “The British public will with good reason see this new probe by the Government’s so-called independent adviser as yet another attempted whitewash.
“Following the lengthy and ongoing delay of the Sue Gray report, confidence in this Government’s ethical credibility is already lying in tatters.
“There is a whole catalogue of outstanding questions not only for the Chancellor but for the Prime Minister himself. The British people both need and deserve answers.
“It’s time to come clean on this whole murky business.”
Following revelations into his wife’s tax status and the Chancellor’s US green card, Mr Sunak asked Lord Geidt to investigate his declarations.
The Prime Minister agreed to the request and insisted he still has confidence in Mr Sunak.
The Chancellor’s wife, Akshata Murty had held non-domiciled status which meant she was not required to pay UK tax on her overseas income.
She has since announced she will pay UK tax on all her worldwide income.
It was also revealed Mr Sunak had held a US green card - which allows permanent residency in America - until October 2021. He was appointed Chancellor in February 2020.
Mr Johnson and the Chancellor have also come under pressure after the Met Police said both had been fined as part of the probe into gatherings held in Downing Street and Whitehall during lockdown.
Both apologised following the fines, although some MPs have called on Mr Johnson to resign.
