As Canada prepares to retaliate in the trade war, what pain can it inflict the US?

Canada said it will announce on August 25 its response to President Donald Trump's new tariffs, as neighbors that used to be close allies spiral into a trade war. This comes after representatives from both countries failed to come to an agreement that would avert new 50% US tariffs on a selection of Canadian goods, which started a few days earlier. FRANCE 24's Charles Pellegrin takes a look at what Canada could do to put pressure on the US.