Two of the six MPs who are set to investigate Boris Johnson over partygate tried to get disgraced former minister Owen Paterson off the hook last year.
They sit on the Privileges Committee, which will launch an inquiry into whether the prime minister misled Parliament about lockdown-busting parties in Downing Street.
Laura Farris and Sir Bernard Jenkin, both Conservative MPs, voted in November to overrule the Standards Committee in a botched attempt to save Paterson from suspension – despite his rule-breaking lobbying work.