BERLIN (Reuters) - The German parliament will ratify the EU constitution next month, a government spokesman said on Monday, dismissing both a legal challenge and the prospect of a clash with the federal states over the issue. "For me there is no question that the Bundestag (lower house) will decide on May 12," government spokesman Thomas Steg told a regular news conference. "I expect...as the state premiers clearly told the Chancellor in December, that the Bundesrat (upper house) will decide on May 27," he said. Unlike France, Germany has decided not to hold a referendum on the European Union constitution,...