U.S. President Donald Trump threatened on Tuesday to eliminate subsidies for General Motors Co in retaliation for the automaker cutting U.S. jobs and plants, and the automaker also took fire from Canadian political and labor leaders for cutbacks there.

“The U.S. saved General Motors, and this is the THANKS we get! We are now looking at cutting all @GM subsidies, including ... for electric cars,” Trump said on Twitter.

Trump did not explain what “subsidies” he was referring to.

GM electric vehicles are eligible for a $7,500 tax credit under federal law, but it is not clear how the administration could restrict those credits or if Trump had other subsidies in mind.

Trump’s harsh words rattled investors, who bid down GM shares by 2.6 percent on Tuesday after sending them up on Monday in response to the automaker’s cost-cutting.

Trump and Canadian Prime Minister Justin Trudeau “discussed their disappointment in the announced closures of General Motors plants in their respective countries” during a phone call on Tuesday, White House spokesman Hogan Gidley said.

GM said in a statement following Trump’s comments that it was “committed to maintaining a strong manufacturing presence” in the United States after investing $22 billion in operations here since 2009 and will add new jobs in electrification and autonomous vehicles.

The cuts will “position the company for long-term success and maintain and grow American jobs,” GM said, adding that many workers at impacted plants will be able to move to other GM factories.

GM Chief Executive Mary Barra spoke to Trump over the weekend to discuss the cuts and was at the White House on Monday to meet with economic adviser Larry Kudlow.

Kudlow told reporters on Tuesday that the administration had helped GM with fuel efficiency standards and other regulations. (Reuters)

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