[JURIST] Luxembourg leaders say they will stick to their original plan for a July 10 referendum on the embattled European Union constitution [JURIST news archive]. Following popular rejection of the charter in France and the Netherlands, seven other European countries have thusfar postponed similar votes [JURIST report] and the ratification deadline has been extended to at least 2007 [JURIST report]. Luxembourg Prime Minister Jean-Claude Juncker [official website], whose country has held the EU Presidency [official website] for the past tumultuous six months, says he will resign [AFP report] if his country votes against it. Opinion polls show the issue getting tighter, with the Yes side holding a 10-point lead, down from 18 points since May. Xinhua has more.