If the strike drags on, the toll will be felt in the London region. Almost 50,000 workers are walking out of 33 auto plants across the country.
The last strike 12 years ago lasted only three days, but some strikes against GM in the past have stretched on for months. Steep discounts were offered to consumers this summer to sell the remaining cars and hatchbacks.
"That's our brothers and sisters right down the road, and it could be us next", said Tiller. "America's workers deserve better".
The impact, however, on Magna parts plants in St. Thomas is less clear. On the majority of issues, UAW and GM are not even close to getting an agreement.
If workers strike, experts say it would mean fewer vehicles for you to choose from at your local dealership.
Just before midnight Sunday, over 1,000 autoworkers marched out of GM's Flint Assembly plant in Flint, Michigan, in what is the first national strike by the United Automobile Workers (UAW) union in over a decade and what could be extremely costly to the company - and the employees - if it's not resolved quickly.
Talks were scheduled to resume at 10 a.m. EDT on Monday.
In that strike, a two-day stoppage cost $300m (£240m). It's time that they share with the workers.
The strike has the potential to put Trump in a high-profile showdown with the UAW in the heart of the Rust Belt.
She said workers gave up cost-of-living pay raises to help GM get through bankruptcy, and workers want some of that back now that the company is making profits.
When asked if electric pickup truck production could be one of the "solutions" for unallocated plants in MI and OH, a GM representative declined to comment. If Trump were to turn against the striking workers, it could potentially alienate him from his base in crucial battleground states like OH and MI ahead of the 2020 election. The Lordstown assembly plant in western OH has been idle since March.
While GM has enjoyed several years of strong sales, last year recording $11.8 billion in operating profits, concerns have grown about a possible recession amid trade tensions.
In a statement, GM said it offered improved wages, benefits and additional U.S.jobs. Also, the union has been fighting to stop GM from closing auto assembly plants in OH and MI. "We do what we gotta do here, we build the engines for these vehicles".
The UAW has vowed to win GM's agreement at the negotiating table to keep all or at least some of those plants operating.
"We stood up for General Motors when they needed us most", said Terry Dittes, UAW vice president and head of the union's GM department.
GM starts the strike with healthy levels of inventory of some of its key, high-margin vehicles.
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