Trade war with Canada adds a challenge in Senate races

WASHINGTON — President Donald Trump’s trade war with Canada could intensify the headwinds Republicans are navigating ahead of the November midterms, with its effects poised to reverberate in northern battleground states with crucial Senate races.

With the election less than six weeks away, Republicans are facing an increasingly bleak outlook, as new polls this week showed voters favoring Democrats by as much as 12 points amid widespread cost-of-living anxiety and low approval for Trump.