On Monday, Liberal Democrat Wendy Chamberlain raised the issue in the House of Commons. He said the matter could not be investigated by an independent official due to the resignation of Lord Geidt. “Following the resignation of the Prime Minister’s Independent Adviser on Ministerial Standards, there is currently no mechanism by which any inquiry into the Prime Minister’s Code of Conduct can be conducted, other than at the behest of the Prime Minister himself.” Mrs Chamberlain. he said. “While the ministerial code remains a matter for government, members will continue to be concerned about the standards and behavior of those on Downing Street.”

The allegations were rejected as “completely untrue”

Separately, the Telegraph understands that Liz Truss is going to be questioned about the claims in a select panel appearance next week. Members of the Foreign Affairs Committee, who will ask the Foreign Minister next Thursday, plan to ask her about the allegations. Mr Johnson could also be asked about them directly in the Prime Minister’s Questions on Wednesday. Select committees and debates on the Commons are held under the prerogative of Parliament, which allows Members to discuss disputes without fear of legal action. The allegations against Mr Johnson, who sought to nominate his future wife, were first published in a biography of Mrs Johnson by Lord Ascroft, Tory’s peer and former party chairman. The Times story, which went into more detail about the alleged debate over the idea, was written by Simon Walters, a freelance reporter and former political writer for the Daily Mail and Mail on Sunday. A spokeswoman for Carrie Johnson said the story was “completely untrue”.