Lydia Hu reports on Canada's new retaliatory tariffs targeting $20 billion of U.S. goods after trade negotiations stall. Shawna Morris of the National Milk Producers Federation weighs in on the escalating US-Canada trade fight.

Canada announced tariffs on about $20 billion worth of U.S. goods, in response to the latest round of tariffs on Canada.

The United States has sharply escalated its trade war with Canada, banning some Canadian imports after retaliatory Canadian tariffs took effect on about $20 billion in U.S. goods.

A set of U.S. exports to Canada face heavy tariffs in retaliation for President Trump's levies on Canadian goods. CBS News' Aaron Navarro reports.