Senate Republicans are bracing for the passage of a bipartisan bill to undo President Trump’s 25-percent tariff against Canada, which would deal Trump an embarrassing setback on “Liberation Day,” an occasion the president has proclaimed to announce a new round of tariffs.

Four Republicans — Sens. Rand Paul (Ky.), Susan Collins (Maine), Lisa Murkowski (Alaska) and Mitch McConnell (Ky.) — have indicated publicly or privately that they would vote for the resolution, according to Senate Democrats.

Paul, who is a co-sponsor of the measure, said Trump’s tariff war against Canada is bad for the economy and an end-run around Congress, which he says has sole constitutional authority to raise taxes.

“Trade is a good thing. Trade is proportional to prosperity, and so tariffs are bad economically,” he said. “It’s a terrible idea to run a country by emergency where representatives to vote on raising or lowering taxes.”

Paul said tariffs “are bad for the country, bad for prosperity, bad for the economy.”

“Our Constitution was very specific that taxes — tariffs are a tax — taxes originate in the House, come to the Senate and then go the president,” he said. “They don’t just go to the president and no one else. What kind of system would it be if all of our taxes and laws were passed by one person?”

Trump, citing the threat of fentanyl coming across the northern border, has invoked his........

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