New Libyan Prime Minister Ahmed Miitig speaks during a press conference on June 7, 2014 in the capital Tripoli.
Libya's supreme court ruled on Monday that the election of prime minister Ahmed Miitig in a chaotic session in the interim parliament in early May was "unconstitutional".
"The court has judged the election of Miitig at the General National Congress (the interim parliament) as unconstitutional," a judge at the court said after a short hearing.
Outgoing premier Abdullah al-Thani had said he would await the judiciary's ruling before deciding whether to hand over power.