A letter is being circulated among Labour MPs this afternoon calling for a secret ballot in Gordon Brown's leadership.
According to one MP who would like Brown to leave office, the letter is being coordinated by a number of rebels including the former cabinet ministers Charles Clarke, Patricia Hewitt and Geoff Hoon.
However, there are questions being asked as to whether any move can be made against Brown today, in the midst of heavy snow-fall as much of the UK has ground to a halt.
"It may not be possible because of the snow," one MP said. "But the idea is that at the very least it forces Brown to give a commitment that if he stays on to fight the election he will not serve more than one year."
Terrible timing, if true. Why do it on a day when Brown put in quite an impressive performance at PMQs? As on previous occasions, I doubt very much whether this will come to anything.