Chris Hayes warns that Trump, free from any guardrails, is acting on his worst impulses, as his trade war with Canada brings the U.S. economy to the brink.

U.S. President Donald Trump's tariffs can boost manufacturing activity in the United States, the world's largest economy, Blackstone Chief Executive Stephen Schwarzman said on Wednesday. Trump's focus on tariffs since taking office in January has shaken investors,

President Trump is doubling down on his widespread tariffs threats despite a stock market downturn that has helped fuel anxiety the nation could slide into a recession. Trump escalated the tit for tat with Canada on Tuesday when he said his administration would increase planned steel and aluminum tariffs in response to an electricity