Canada is preparing to impose retaliatory tariffs on US imports as high as 50%.

On Tuesday morning, Canadian officials outlined Ottawa’s response to a growing trade war with the US after talks between North America’s two largest economies broke down.

The targeted list of roughly 700 products ranges from steel and aluminum to all types of fresh and frozen fish. Also on the list is rail equipment, paper products, plywood, and T-shirts. All told, the Canadian government said the countermeasures will target $27.6 billion worth of US imports (roughly $20 billion in US dollars).

Canada is set to impose the retaliatory tariffs starting at 12:01 on September 8, the day after Labor Day. Labor Day is also traditionally considered the start of the final sprint before the US elections, adding the potential costs the Trump administration may face if both sides remain at loggerheads.

Of particular note, lobsters, including Maine’s iconic variety, are subject to a 25% tariff on fresh and frozen forms. Maine’s US Senate race is one of the most closely watched in the country. Democrats’ easiest path to the majority would involve ousting longtime incumbent Sen. Susan Collins, a Republican, who notably blasted the Trump administration’s actions as a mistake.

Without naming specific products, a member of Canadian Prime Minister Mark Carney’s cabinet made clear that politics were top of mind when determining which products to target.

“When we’re looking at the countertariffs, we’re looking first at the businesses that are affected here,” Industry Minister Mélanie Joly told reporters, adding, “We’re also targeting products that will target states in the US, and so we’re being wise and strategic to put political pressure.”

Most notably for now, Canada is not targeting energy and potash, two areas on which the US is heavily reliant. In 2023, Canada was responsible for 52% of US gross petroleum imports, according to the U.S. Energy Information Administration. Potash is a key ingredient in fertilizer, and the US is heavily reliant on Canada for it. University of Illinois economists found last year that since 2020, Canadian potash has accounted for more than 80% of US potash imports.

Ontario Premier Doug Ford, who has frequently tangled with President Donald Trump, threatened on Monday during an interview with the Associated Press to cut off the US from the cross-border transmission lines.

“He wants to put pain on Canadians? We’ll leverage every bit of pain we possibly can on Americans,” Ford told reporters.

On Saturday, the US imposed 50% tariffs on a host of Canadian goods. Separately, President Donald Trump announced on Monday that he could impose 50% tariffs “on all Cars, Trucks, both large and small, Automotive Parts, and Steel,” beginning on January 1, notably after the midterm elections.

Earlier Tuesday, before Canada outlined its response, Trump threatened to rename Lake Ontario to Lake America.