From Ynet:

French President Nicolas Sarkozy reportedly told US President Barack Obama that he could not “stand” Prime Minister Benjamin Netanyahu and that he thinks the Israeli premier “is a liar.”

According to a Monday report in the French website “Arret sur Images,” after facing reporters for a G20 press conference on Thursday, the two presidents retired to a private room, to further discuss the matters of the day.

The conversation apparently began with President Obama criticizing Sarkozy for not having warned him that France would be voting in favor of the Palestinian membership bid in UNESCO despite Washington’s strong objection to the move.

The conversation then drifted to Netanyahu, at which time Sarkozy declared: “I cannot stand him. He is a liar.” According to the report, Obama replied: “You’re fed up with him, but I have to deal with him every day!”

The remark was naturally meant to be said in confidence, but the two leaders’ microphones were accidentally left on, making the would-be private comment embarrassingly public.

The communication faux pas went unnoticed for several minutes, during which the conversation between the two heads of state – which quickly reverted to other matters – was all but open to members the press, who were still in possession of headsets provided by the Elysée for the sake of simultaneous translation during the G20 press conference.

[…]

The surprising lack of coverage may be explained by a report alleging that reporters present at the event were requested to sign an agreement to keep mum on the subject of the embarrassing comments.

Full article here.