President Donald Trump's escalation of the trade war with Canada is coming at a bad time for Senate Republican candidates, who are being put in the awkward place of having to defend the administration's economic record while having to push back against Trump's targeting of critical Canadian imports and companies.

One expert warns Trump's "very dangerous and very disruptive policies toward Canadians" spark uncertainty north of the border.

President Trump is not the first American president to feud with Canada. But today’s crisis might be the worst.

President Donald Trump on Tuesday moved to sharply escalate the trade war with Canada, seeking to block the import of some autos, dairy products and alcohol.

Although Trump issued an executive order to change the name of Lake Ontario, the change was not recognized by Canada. There are other geographic areas that are referred to by multiple names, but the AP says that it “strives to use terms recognizable to the broadest audience.”

A Canadian province made clear that Donald Trump’s threats mean nothing to it. David Eby, premier of British Columbia, unveiled new signs Tuesday that will be displayed at border crossings in the Pacific Northwest and emphasize that the province will always be part of Canada.

Trump's latest tariff exemptions amount to a tacit admission that the president's Canadian trade war is a political liability heading into November.