This morning, Sir Keir Starmer's cabinet is split on the most fundamental political question a government's top table of ministers can ever wrestle with: whether the prime minister should carry on.
Clearly, a cabinet split on this is unsustainable. Either cabinet ministers have to resign or be sacked, or the prime minister himself has to go.
Last night, ministers went in to see Sir Keir and he was met with a range of advice. Some said he should fight on. Some said he should set out a timetable for his departure. And others, as he weighed his options, tried to help him kick around how he might deal with the scenario he now confronts.
A dam now appears to have broken, with Labour MPs posting their public loss of confidence in the prime minister with such frequency it can be hard at times to keep count of them.
In the hours after the prime minister's crunch speech on Monday, the verdicts, public and private, began to flow.
