Labor senator Kristina Keneally has credited the coalition government with "stopping the boats" but warned people smugglers are now bringing in asylum seekers by plane.
Senator Keneally is going on the offensive against the Home Affairs minister over a "massive blowout" in the number of asylum seekers who arrive in Australia by air.
Almost all of them are found not to be refugees, and they are then put on two to three-year bridging visas.
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There are now nearly 230,000 people on bridging visas in Australia, and there are fears many of these people are being exploited in workplaces.
"Peter Dutton has lost control of borders at our airports," Senator Keneally told Sky News on Sunday.
"We've got to give Scott Morrison and Kevin Rudd credit for stopping the boats.
"But Peter Dutton seems to have missed the fact the people smuggling operation has shifted from boats to planes under his watch."
A spike in the number of asylum seekers arriving into Australia by air will be targeted by a Labor roundtable meeting with migration and border security experts on Monday.
"Ninety per cent of these people are found not to be refugees," Senator Keneally said.
"But they are coming largely from Malaysia and China - they are being sent here by criminal syndicates and illegal labour hire companies."
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Senator Keneally said people were being sent off to work in "quite exploitative, sometimes slavery-like conditions" in horticulture, hospitality and sexual servitude.
Of the nearly 230,000 people on bridging visas, some are asylum seekers, others are applying for skilled visa positions having been here as students or temporary workers, and some are waiting for partner visas.
AAP
