Liz Truss is given yet another boost as 21 top Tories sign an open letter declaring she has what it takes to be the next PM
- Truss appeared to put pressure on Sunak to stand down as she shared letter
- Backers include Lord Frost, Ben Wallace and Sir Iain Duncan Smith
- Signatories argued that only Miss Truss ‘has what it takes’
- Letter was released as Sunak’s campaign appeared to stall
