PARIS (Reuters) - French President Jacques Chirac on Monday backed his prime minister in a confrontation over a youth job law, urging unions and students to enter constructive talks on the measure rather than threaten strikes. Buoyed by protests at the weekend that organizers said brought 1.5 million people on to the streets nationwide, union leaders set a Monday evening deadline for the government to withdraw or suspend the so-called First Job Contract (CPE) law. Prime Minister Dominique de Villepin has shown no signs of backing down over the law, which allows employers to fire people under 26 for any...