After months of back-and-forth, will-he-or-won't-he, it's officially on: U.S. President Donald Trump has slapped 25% tariffs on most Canadian goods, and 10% on Canadian energy. Canada has hit back with tariffs of its own — which Trump says will cause further retaliation.

CBC Washington correspondent Alexander Panetta joins us for a look at what happens now. Will measures from the federal government, or any of Canada's premiers, make any difference? What are the offramps? And how long could this all last?

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