The 65-year-old economist, whose high-flying career imploded when he was accused of sexually assaulting a New York hotel maid in 2011, is back in court over his role at the centre of a prostitution ring.
Once one of the most powerful men in the world, Strauss-Kahn sat in the dock alongside a colourful cast of characters including luxury hotel managers, a prostitute, police, and a brothel owner nicknamed "Dodo the Pimp."
Lawyers for several of the 14 accused, including Strauss-Kahn, called for the case to be declared invalid over claims some of their clients had their calls intercepted on orders from former prime minister Francois Fillon's office in June 2010, eight months before the official investigation began.
The allegation, based on a book written by a former policeman, a witness statement in a separate case and a report by an investigative journalist, meant the accused "could not receive a fair trial," said one of their lawyers, Sorin Margulis.
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Presiding judge Bernard Lemaire, who earlier dismissed a request for ex-prostitutes to testify behind closed doors, said the question about the secret probe would be included in the trial.
He earlier read out the charges against Strauss-Kahn, accused of being at the centre of a vice ring which hired prostitutes for sex parties in Brussels, Paris and Washington.
"You are accused of aiding and abetting the prostitution of seven persons between March 29, 2008 and October 4, 2011, and of hiring and encouraging the prostitution of these same persons," Lemaire said.