On Friday, U.S. President Donald Trump vowed to put a 'major tariff' on Mexico for lettuce he claims is behind the spread of a diarrhea-causing parasite and a 'big tariff' on Canada in response to wildfire smoke crossing the border. Shredded lettuce from a Mexican branch of American-based produce supplier Taylor Farms previously tested positive for Cyclospora at the U.S.-Mexico border. The FDA said it ended up being a false positive, but later clarified on social media there is still ‘overwhelming epidemiological data’ supporting the company’s large voluntary recall. »»» Subscribe to CBC News to watch more videos: http://bit.ly/1RreYWS For breaking news, video, audio and in-depth coverage: https://www.cbc.ca/news Follow CBC News on TikTok: https://www.tiktok.com/@cbcnews Subscribe to CBC News on Snapchat: https://bit.ly/3leaWsr Subscribe to CBC News on WhatsApp: https://www.whatsapp.com/channel/0029Vb6MSjH9Bb63S9tbQa1Y Download the CBC News app for iOS: http://apple.co/25mpsUz Download the CBC News app for Android: http://bit.ly/1XxuozZ »»»»»»»»»»»»»»»»»» For more than 80 years, CBC News has been the source Canadians turn to, to keep them informed about their communities, their country and their world. Through regional and national programming on multiple platforms, including CBC Television, CBC News Network, CBC Radio, CBCNews.ca, mobile and on-demand, CBC News and its internationally recognized team of award-winning journalists deliver the breaking stories, the issues, the analyses and the personalities that matter to Canadians.