Pres. Trump doubled down on the promised tariffs, causing a stir on Wall Street amid concerns over the economy. This came as Trump held a high stakes phone call with Canada's new prime minister. ––– Subscribe to ABC News on YouTube: https://abcnews.visitlink.me/59aJ1G ABC News is your daily source of breaking national and world news, exclusive interviews and 24/7 live streaming coverage. Download the ABC News app for the latest headlines and alerts: https://abcnews.go.com/devices Watch 24/7