Prime Minister Scott Morrison has announced the detention facilities on Christmas Island will be re-opened to guard against a feared influx of asylum seeker boats.
Mr Morrison told reporters on Wednesday, "we have approved putting in place the re-opening of the Christmas Island detention facilities, both to deal with the prospect of arrivals as well as dealing with the prospect of transfers".
He said the measure was part of "a range of strengthening" of Operation Sovereign Borders' capacity needed because of a bill which would make it easier to medically evacuate critically ill asylum seekers from offshore detention centres to Australia.
The bill has now passed both houses of Parliament against the government's wishes, after Labor forced a vote earlier on Wednesday.
Mr Morrison warned Labor's amendments to the bill could restart the people-smuggling trade.
"My job now is to ensure that the boats don't come. My job now is to do everything within my power and in the power of the government to ensure that what the parliament has done to weaken our borders does not result in boats coming to Australia," he said.
He denied his ramped-up rhetoric played into the hands of people smugglers, saying "I'm standing between people smugglers and bringing a boat to Australia".
Bill only applies to those already on Manus, Nauru
The fast-tracked medical transfers will only apply to the existing cohort of refugees and asylum seekers on Manus Island and Nauru, a point that Mr Morrison refused to concede at the press conference.
"If we're re-elected it won't apply to anybody because I will reverse it ... It's not my law. I think it's a foolish law. It's a foolish law and it's not one that I support."
He argued people smugglers did not deal with the nuance of the "Canberra bubble" but rather the psychology of messaging about "stronger" and "weaker" borders.
"It might be all fine and nice to talk about these nuances here in this courtyard," he said.
"But when you're in a village in Indonesia and someone is selling you a product, there's no protection or truth in advertising for people smugglers."
Reaction has been swift, with shadow attorney-general Mark Dreyfus slamming the government on Twitter.
Meanwhile MP Kerryn Phelps, a key supporter of the bill, dismissed concerns that there will be an influx of new boat arrivals.
"It's only the cohort who are currently on Manus Island and Nauru who will benefit from legislation. That's to ensure that there is no catalyst to start up the boats again," she told the media on Wednesday.
Ms Phelps also reiterated her support for Operation Sovereign Borders as, she "doesn't want to see people smuggling trade increased".
Senate debate
In the Senate on Wednesday, government Senate leader Mathias Cormann said the medical transfer legislation would compromise Australia's border protection regime and national security.
"As a result of Bill Shorten's bill, rapists, murderers and paedophiles will still get a free pass into this country. Bill Shorten should be ashamed of himself," he said.
Labor Senate leader Penny Wong launched a fiery attack on the government, accusing the coalition of "shameful" leaking of an intelligence briefing which had warned against the bill.
"There are lies being told about this bill by those opposite and they are doing it because they are desperate," she said.
"Rather than running these lies, why don't you just call an election?"
The Christmas Island detention centre closed in late 2018.
At the time, Immigration Minister David Coleman said the centre would be kept in a state of "operational readiness" so it could be re-opened at short notice.
The island was the scene of a , when 50 asylum seekers drowned when their boat sank after hitting rocks near Flying Fish Cove.
