Debate on draft laws to strip Australian citizenship from dual-national terrorism suspects will be delayed yet again.
Federal parliament was finally due to consider the anti-terrorism bill on Wednesday but Labor sought more time for another briefing by the government.
It's understood the legislation will not come up for debate until Thursday.
In a letter to Immigration Minister Peter Dutton, opposition immigration spokesman Richard Marles requests more time to cover all the recommendations of a bipartisan parliamentary inquiry.
Mr Marles says he's only been briefed on 12 of the 27 recommendations which call for greater oversight and protection of rights.
"I would request that the bill not be brought on for debate until these briefings have been provided," he wrote.
Earlier, Labor leader Bill Shorten said while the opposition had yet to fully consider all of the amendments it would not unduly delay passage of the legislation through parliament.
The government is confident the amended laws will withstand a High Court challenge.
"It's gone through a proper process now, and we are confident that it would survive a High Court challenge, but only time will tell," Prime Minister Malcolm Turnbull told reporters in Canberra.