It's been a tumultuous political week in which, for a while, Gordon Brown's grip on government appeared to loosen.
A clutch of ministers resigned. But, after carrying out a reshuffle, the Prime Minister insisted that HE would not walk away.
How Labour MPs react to that remark will determine his future. Many of them are clearly disillusioned with his leadership - especially in the light of Thursday's crushing defeat in the local elections.
In this programme, three senior MPs and one former Downing Street aide weigh up the odds on his future and assess how far the Conservative and Lib Dem challenge will succeed.
Labour's Diane Abbott, the Conseravtive Peter Lilley and the Lib Dems' Simon Hughes are joined by the former adviser to Tony Blair, Matthew Taylor. The presenter is Peter Oborne of the Daily Mail.