What’s going on with Justin Trudeau and why is he expected to resign??

https://www.bloomberg.com/news/articles/2025-01-06/canada-s-trudeau-is-likely-to-resign-this-week-globe-reports

I just saw on Twitter and now multiple major news sources that he is likely to resign this week, but I have not been keeping up with the news lately so I guess I’m missing something?? This seems like a very out of nowhere surprise to me, I don’t know a lot about him or if he has any ongoing scandals.