Plans to end car production at a Jaguar car plant in the West Midlands are being discussed by MPs on Tuesday.
Sales of Jaguars have dropped in the key US market
The debate has been called by Coventry MP Jim Cunningham, who hopes owner Ford will reconsider its proposals to shed 1,150 jobs.
Unions say the proposals for Coventry's Browns Lane factory renege on recent agreements with the American company.
Jaguar says the current situation is unsustainable and Browns Lane does not have the infrastructure of other sites.
Derek Simpson, Amicus general secretary, said: "We hope the parliamentary debate and the imminent hearing by the influential DTI Select Committee that will call on senior Ford executives to give evidence, will increase the political pressure on Ford to examine alternative options.
"We want the company to enter into constructive negotiations with trade unions and reverse its decision."
Tony Woodley, the T&G's general secretary, added: "The response from MPs to Ford's announcement has been very strong, with more than 100 MPs signing an Early Day Motion expressing their concern at the company's actions."
Jaguar has seen demand for its models drop in the US, its key market, and has been looking at how to reduce costs.
Plans were announced last week for a major march and rally in Coventry on 27 November in support of keeping car production at Browns Lane.
Under Ford's plans the assembly of Jaguar models will transfer to the nearby Castle Bromwich plant, with 400 voluntary redundancies.
Up to 425 of Browns Lane's workers will move to Castle Bromwich while a further 310 will remain in Coventry to make wood finishes for Jaguar models.
In addition to the 400 voluntary redundancies, 750 mostly white-collar jobs will go across the Jaguar Group as back office work is combined with Land Rover.