Libya fired the latest salvo in a legal battle over the trial of Muammar Gaddafi’s son, officially asking world war crimes court judges to quash a surrender request and throw out the case.

“The Libyan government requests the Chamber to declare the case inadmissible and quash the surrender request,” Libya’s lawyers said in a document, filed before the International Criminal Court.

Tripoli and the ICC have been at loggerheads since Seif al-Islam’s capture in November last year over where he should be tried. But the ICC had issued an arrest warrant in late June last year against Seif and ex-Libyan security boss Abdullah al-Senussi and it wants to see them tried in The Hague. A third warrant was nullified after Gaddafi was killed by rebel forces in October 2011.

The new Libyan government said earlier it would file official papers by April 30 before the ICC to spell out reasons why Seif should be tried at home.

On April 6, Libya filed an appeal against the ICC’s request for the immediate transfer of Seif, wanted for crimes against humanity by the court. The ICC has rejected the Libyan appeal.

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