"They are not closing our damn plant without one hell of a fight".
Stojkovic said she blamed both GM and the union, Unifor, for the dearth of information.
Dias said the plant has won "every award" and was the best by "every matrix".
Ford said along with shock and sadness, come feelings of anger and betrayal.
"Based on commitments made during 2016 contract negotiations, Unifor does not accept this announcement and is immediately calling on GM to live up to the spirit of that agreement", the union's statement said.
Trudeau tweeted on Monday that he "spoke with GM's Chief Executive Mary Barra to express his deep disappointment in the closure".
She added that the largest United States automaker is "taking these actions now while the company and economy are strong, to stay ahead of fast-changing industry and market conditions".
The automaker expects the moves to contribute $6 billion in cash savings by 2020 - $4.5 billion in cost reductions and $1.5 billion in lower capital expenditures. We're sick and exhausted of GM shipping all our jobs to Mexico.
Not happy.that's what President Donald Trump is saying after General Motors announced they will be closing up to five plants, and laying off almost 15,000 workers.
The impending shutdown is "scary", said Matt Smith, who has worked at the Oshawa plant for 12 years. GM will also decrease its executive staff by 25% as well. As many as 14,000 are bracing for pink slips across North America. "It's a kick in the nuts".
The two MI assembly plants GM announced will close are the Detroit-Hamtramck Assembly Plant and the Warren Transmission Plant.
The sudden and apparently irreversible closure of one of GM's oldest vehicle plants represents a new challenge for Prime Minister Trudeau after a year of uncertainty over the future of North American trade, continuing tariffs on steel and aluminum and new North American content rules for autos.
The closures come as North American automakers feel pressure from US tariffs on imported steel and aluminum.
One potential partner could be Honda Motor Co., which already has r&d relationships with GM for fuel cell and autonomous vehicles.
He said the move was part of a wider need to stay nimble and adapt, especially after the 2008 recession.
Nolan also wondered whether U.S. President Donald Trump's threats to impose tariffs on Canadian built vehicles played a role.
Unifor President Jerry Diaz speaks after GM announced plans to shut down operations in Oshawa.
Under the new trade deal, 40 per cent of the content of automobiles must be produced by workers earning at least US$16 per hour to qualify for duty-free movement across the continent.
Many workers were still trying to comprehend why on Tuesday morning. "So we're growing faster than anyone in the industry in new technology, at the same time as we're unfortunately going through next year this really hard change with regard to our manufacturing base in Canada". GM said it is investigating the possibility of retooling the assembly plants to make other vehicles. Its closure, he said, will risk the loss of as many as 15,000 jobs at those companies. The company's other Ontario operations include the Cami factory in Ingersoll and an engine and transmission plant in St. Catharines.
The changes announced Monday will not impact GM's new trucks and SUVs, which are Barra said are "doing very well".
After the shocking announcement about the Oshawa plant, the frightening reality is, we just don't know.
"Oshawa is building the previous generation trucks that are very helpful in the crossover period".
Joanna Stojkovic, clutching her seven-month-old daughter, put down the phone after her GM worker husband passed on the news.
"If there is a "canary" out there it has been slowly dying for quite some time", DesRosiers said by email.
The decision is "devastating" for workers at the plant and auto suppliers, but Oshawa has adapted over the years and will survive this as well, DesRosiers added.
Not allocating product doesn't mean the plants will permanently close, but it puts their future and the jobs of roughly 6,700 hourly and salaried factory employees - 3,800 in the US and 2,900 in Canada - at risk heading into contract negotiations with the UAW in 2019 and Unifor in 2020.
John Henry, the mayor of Oshawa, said early on Monday on Twitter that he hadn't talked to GM yet, and that a meeting was scheduled to begin at 09:30 a.m. Ontario time between the management and workers.
Ford vowed that the provincial government will help Canadian workers look for new jobs, saying he has authorized Employment Ontario to deploy its Rapid Re-Employment and Training Services program.
"If Canada isn't competitive in this environment, then it will see more of these", DesRosiers said.
"While the company is entitled to make its own business decisions, I am confident that history will prove them wrong".