This is a moment of reckoning for Prime Minister Justin Trudeau.
The question of whether to stay or go, or to deliver some other kind of dramatic change the Liberal caucus is clamouring for, is one of the most sensitive and solitary exercises a prime minister can undertake.
Sometimes the moment arrives when bitter internal rivalries push a leader out, as happened to Jean Chrétien. Sometimes it comes on the night of a general election defeat, as it did for Paul Martin and Stephen Harper.
