"We are not stopping our strike. Moreover, we will be calling for a national strike," Labrousse said in an interview with France Info radio station.
Labrousse stressed that despite government's promises to ensure the increase of financing, the real economic and political changes were necessary.
The factory in La Souterraine, which employs 283 people, was pronounced insolvent in December 2016 and given until May 23 to find a new owner. The workers have long been staging protests against factory's shutdown, threatening to blow up the site's premises earlier in May.
According to the car manufacturers, the measure would allow the factory to reach about $28 million turnover in 2017, which was a key condition to keep the site running.
The hearing on the GM&S factory's bankruptcy will be held on Tuesday in Poitiers. The automobile producers seek to move their production outside France after failed six-month negotiations on saving the jobs and keeping the plant running.
French President Emmanuel Macron is set to meet the members of the trade union on Tuesday to discuss his long-anticipated reform of a labor law, seen by many as a controversial move aimed at supporting the huge enterprises rather than protecting jobs.
