The investigation into Mr Gwynne was opened on 18 February 2025 and is relevant to paragraph 11 of the members' code of conduct which states MPs "shall never undertake any action which would cause significant damage to the reputation and integrity of the House of Commons as a whole, or of its members generally".
As well as taking action against Mr Gwynne, the Labour Party also suspended newly-elected Burnley MP Oliver Ryan over comments made in the WhatsApp group.
According to the parliament website, Mr Gwynne, who now sits as the Independent MP for Gorton and Denton, is being investigated specifically for "actions causing significant damage to the reputation of the House as a whole, or of its members generally".
Asked if Sir Keir Starmer expected ministers to call out derogatory remarks in WhatsApp groups, his official spokesman told reporters: "He's made clear… his determination to uphold high standards of conduct in public office and lead government in service of working people.
Andrew Gwynne, who was also suspended from the Labour Party earlier this month, is listed among the allegations under investigation by Daniel Greenberg, the standards commissioner.
