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(AP File Photo)

After learning General Motors will lay off more than 600 Ontario employees, a union representing the workers called the move "a betrayal and shows why NAFTA is a terrible deal for Canadian jobs."

Unifor Local 88 reports in a news release that GM will layoff 635 jobs at the GM Cami Assembly plant in Ingersoll, Ontario as production of the GMC Terrain moves to Mexico.

"This decision reeks of corporate greed. It is not based on sales, it is an another example of how good jobs are being shifted out of Canada for cheaper labour in Mexico and Unifor will not let it happen without a fight," Unifor National President Jerry Dias said in the release. "The Equinox and Terrain are incredibly successful vehicles and given current market demand, there is no justification for lay-offs at the CAMI facility."

Unifor Local 88 President Dan Borthwick said, according to Automotive News, that "if the Terrain wouldn't have left to Mexico those jobs would most likely be here."

News to lay off more than 600 workers at CAMI-GM is a betrayal & shows why NAFTA is a terrible deal #cdnpoli #canlab https://t.co/cNOpmbdXjG — Jerry Dias (@JerryPDias) January 27, 2017

Earlier in January, GM announced the move of Terrain production to Mexico but said it would expand the Ontario production of the Equinox. In September 2016, GM and Unifor agreed to a new contract to put new investment at the Detroit automaker's facilities in Canada.

Dias told reporters in September that Oshawa and GM's other plants have been promised "hundreds of millions of dollars, therefore our fear of closure in 2019 is now over."

"The CAMI - GM plant was not part of the Detroit Three negotiations that happened this past fall where Unifor was able to secure a footprint in auto and more than $1.5 billion in investment for production and jobs," Unifor's news release reads. "While pledging the union's full commitment to do all it can for its members Dias indicated that the announcement should be the last straw for the federal government and called for swift action."

Borthwick told the Automotive News that the current Equinox was scheduled for production at the plant through 2018, but GM officials told Unifor that they would end it a year earlier.

The Local 88 president said this announcement was a "total shock" as it seems "they certainly had a change of mind."

While this news doesn't concern U.S. employees, it does come three weeks after President Donald Trump put GM on notice for importing cars to the U.S. from Mexico.

General Motors is sending Mexican made model of Chevy Cruze to U.S. car dealers-tax free across border. Make in U.S.A.or pay big border tax! — Donald J. Trump (@realDonaldTrump) January 3, 2017

"It was always known we'd have to phase out this older model [Equinox] and it only makes sense for CAMI, operationally, to focus on this vehicle. After July, they'll focus on just one product line," GM spokesperson Jennifer Wright told the Automotive News. "This is just a natural course of business."

About 2,600 workers currently build the Chevrolet Impala, Equinox, Buick Regal and Cadillac XT5 on a flex line at the Oshawa site. The facility lost production of the Chevrolet Camaro last year as the pony car's assembly moved to GM's Lansing plant.

GM employs a total of about 6,600 Unifor members at sites in Ingersoll, St. Catherines and Oshawa. In all, there are about 23,050 Unifor members employed with Detroit's Big Three automakers.