Tension over trade is mounting between the U.S. and Canada. Prime Minister Mark Carney says he's concerned about the U.S. as a trade partner. President Trump is threatening 100% tariffs on Canadian goods if Canada enters a free trade deal with China. Canada says it has no intention of doing so. UC Berkeley Prof. Vinny Aggarwal joins us to discuss. Watch FOX LOCAL San Francisco live for the latest breaking news from San Francisco, Oakland, San Jose and the entire Bay Area. KTVU delivers the best in-depth reports, interviews and breaking news coverage in the San Francisco Bay Area and California Subscribe to KTVU on YouTube: https://www.youtube.com/channel/UCVht... Watch KTVU's newscasts: https://www.ktvu.com/live Download the FOX LOCAL app: https://www.ktvu.com/apps Subscribe to KTVU's newsletter: https://www.ktvu.com/newsletters