Police are investigating 12 events which appear to have met the threshold for investigation, four of which johnson was said to have attended. Police will be interviewing the prime minister and the prime minister's wife. If police come out with more damning revelations, what options would the conservative party have then? Under the conservative party rules, a confidence ballat is triggered when ten % of m p send in letters of no confidence to the chair of the nineten twenety two committee. That 54 letters were re far from there, but it would seem then all of m p a vote in that ballot is the simple majority required to expel him or make him set down.