The largest refinery in the Midwest will have an unpalatable choice if President Trump imposes tariffs on Canadian oil: Pay more for the crude that it transforms into gasoline and dieseljilipark, or slash production.

Both options threaten to increase prices at the pump, albeit modestly if Mr. Trump sticks with the 10 percent rate he announced this month.

It is not clear whether the tariff will take effect after Mr. Trump decided to hold it in abeyance until at least early March.

Yet this refinery, built around 1889 on the south shore of Lake Michigan, near Chicago, is a reminder of just how difficult it can be to undo trade ties that go back decades.

Mr. Trump, like many American leaders before him, appears to be yearning for a kind of energy independence that experts say is impractical and would not benefit individuals or the oil industry.

“We don’t need their oil and gas,pnxbet” Mr. Trump said last month, referring to Canada. “We have more than anybody.”

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The plaintiffs — who include Wendy Davis, a former Democratic state senator, along with a Biden campaign staff member and the bus driver — also testified, saying that the rolling road protest had been frightening and intimidating.

His lawyers admitted that he had carried out the shooting, but they said he was so unwell at the time that he could not know that what he was doing was wrong.

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