They were challenging provisions under the Leadership Code to which they were charged under.
Supreme Court Registrar, John Obed Alilee confirmed this morning, the four are MP for Pentecost constituency, Tony Nari, MP for Tongoa, John Amos, and the MPs for Tanna, Sebastien Harry and Thomas Laken.
Alilee said the application, now registered as constitutional case No 5 of 2015, was filed by their legal counsel, Justine Ngwele. It listed the Republic of Vanuatu as Respondent.