A court in Papua New Guinea will today decide whether to stop asylum seekers being sent to Australia's processing centre on Manus Island.
Opposition leader Belden Namah is challenging the legality of the processing centre in the National Court.
In preliminary hearings, his lawyers applied for an injunction preventing any more asylum seekers from being sent to Manus Island until the case is heard.
They argued the detention of asylum seekers breaches the guarantee of personal liberty enshrined in the constitution.
Mr Namah's lawyers also applied for the court's permission to visit the processing centre.
Lawyers for the PNG government argued the National Court does not have the jurisdiction to deal with constitutional matters.
Justice David Cannings says he will hand down his decision on the applications this morning.