How much can Canada fight back in its trade war with the US?

The US may be the bigger trading partner, but Canada shouldn't be counted out quite yet in the escalating trade war between the two countries.

It is the top customer for 26 US states, including Maine, Michigan, and Wisconsin, as well as being in the top three for 45 of the 50 American states - suggesting Prime Minister Mark Carney has room to manoeuvre in a trade fight.

BBC's Jessica Murphy explains how Canada has more leverage than it may seem in the spiralling dispute.