"it is hard to see how the personal financial doings of Stephen Bronfman, the Liberal Party's chief fundraiser, are the responsibility of the PM, or how they cast him in a bad light."

Hmmmmmm, that's funny. The left doesn't seem to find it hard to find Trump guilty by association for Paul Manfort's doings (also only allegations at this point) but don't you dare cast one of the lefts own in that very same light.