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Harley’s Chief Executive Officer Matt Levatich said in April that the factory in Thailand was a “Plan B” that the company employed after the U.S. abandoned the 11-country Trans-Pacific Partnership free-trade agreement Trump withdrew from last year. He’d said they didn’t relish the investment, which he also said was needed to maintain access to a key market.

The high-profile spat pits the president against one of the best-known manufacturers in Wisconsin, a state of high political importance to Republicans. Trump won the state’s 10 electoral votes by a narrow margin of just over 22,000 votes in 2016, and has repeatedly focused his attention on bolstering the state’s economy while in office.

On Wednesday, Trump is expected to travel to Wisconsin to attend the ceremonial groundbreaking of a Foxconn Technology Group factory set to open by 2020 that proponents say could eventually result in 13,000 jobs.

State leaders, including Republican Governor Scott Walker — who is facing a tough re-election bid this fall — offered the LCD display manufacturer up to US$3 billion in government assistance for locating the plant in the state.

The early-morning missive from the president marked the second consecutive day Trump took aim at the motorcycle maker, after the company said in an SEC filing on Monday that tariffs enacted by the European Union in response to Trump’s penalties on imported steel and aluminum would add as much as US$100 million a year to its costs.