NEW: YouGov poll shows Rishi Sunak is facing a big uphill battle with Tory party members. He loses to every other contender still in the race.

Sunak 37 v Mordaunt 51
Sunak 35 v Truss 54
Sunak 34 v Badenoch 56

— Tom Larkin (@TomLarkinSky) July 19, 2022