Will turning on Canada help Republicans at midterms?

<p>More Republicans in the US have joined President Donald Trump in criticizing and threatening Canada, with a barrage of insults after wildfire smoke moved south of the border. </p><p>Robert C. Rowland, professor of rhetoric and political communication at the University of Kansas, tells us what's behind it, and Maryscott Greenwood, founder of Ottawa Street Strategy, on how Canada can fight back. </p><p><br></p>