A parliamentary committee believed to have found that Boris Johnson misled Parliament will meet on Monday after the former prime minister launched a vitriolic attack on its members and Rishi Sunak.

The privileges committee has decided to bring forward the publication of its damning conclusions after Mr Johnson chose to quit Parliament rather than face a by-election that the panel had been preparing to trigger.

Mr Johnson accused MPs conducting the inquiry into whether he misled the Commons over partygate of a “witch hunt”, as he announced he was quitting the green benches on Friday.

His comments were echoed by Michael Fabricant, the Conservative MP, who decried the “disgraceful treatment” of Mr Johnson by the committee.

John Redwood, another Conservative MP, said: “Sunak supporters used resignations to drive Boris and his supporters from office. To avoid resignations from Parliament the PM has to take the party in a direction more MPs want to go in and use more of its talent.”

However, Mr Johnson’s decision to quit the Commons and denounce the findings against him was criticised by members of the Labour party, including Angela Rayner, who said it was an affront to the British public. 

This is a live story, more updates to come.