PARIS: A defiant French President Francois Hollande vowed to “stand firm” over a controversial labor law, hitting back Friday at unions which urged workers to step up a wave of industrial action. The latest war of words between the government and unions came as France reels from fuel shortages, transport disruption and violent demonstrations, two weeks to the day that it begins hosting the Euro 2016 football championships. “I will stand firm because I think it is a good reform,” Hollande told reporters at a G7 summit in Japan. But the social unrest showed little sign of easing as unions urged workers to pile the pressure on Hollande’s deeply unpopular Socialist government. Representatives of all the main unions urged workers to “multiply and support” the strikes.