Why was Justin Trudeau forced out? With Trump on the horizon, his party wasn’t sure he could win

Justin Trudeau has announced he will step down as Canadian prime minister after his successor is chosen, probably by the end of March. Trudeau says he is leaving because despite being “a fighter”, he cannot lead his party into the forthcoming election while facing internal party divisions. In sum, his caucus, his Liberal party and the country want him gone. So off he goes, perhaps better late than never. But despite his reasoning, his resignation remains difficult to understand.