Allies of Boris Johnson are plotting to submit letters of no confidence in Rishi Sunak as Tory tensions exploded after the ex-PM was referred to the police over new potential lockdown breaches.
Mr Johnson is facing a fresh investigation after the Cabinet Office handed over evidence to cops regarding events at Downing Street and his Chequers country retreat during the pandemic.
Details about possible lockdown breaches were revealed in ministerial diaries the ex-PM handed to the official Covid inquiry, which is due to begin grilling witnesses next month.