Trudeau insists he's staying on as Liberal leader. But what if he changes his mind?

The Liberal caucus is set to meet in Nanaimo, B.C., next week for a retreat ahead of the fall parliamentary sitting. Prime Minister Justin Trudeau insists he will lead his party into the next election despite polls citing his unpopularity among Canadians. Here's a look at what would happen if he decided to call it quits.