I am not sure that there is one example which can meet all your criteria, though there are many examples of stupid things that (almost) everyone agrees he should not have done:

https://en.wikipedia.org/wiki/WE_Charity_scandal

https://en.wikipedia.org/wiki/SNC-Lavalin_affair

https://en.wikipedia.org/wiki/Aga_Khan_affair

https://www.bbc.com/news/world-asia-india-43151115

I still believe his most egregious betrayal of voters was his abandoning proportional representation, without providing any justification.

Trump has had worse WEEKS in this term than Trudeau's entire decade. Not even remotely comparable.