Scott Morrison is campaigning to block a bill that would allow refugees in offshore camps get medical treatment in the country.
"The problem with the bill is it takes control from the government and contracts it out to others who don't have those same interests or responsibilities," Morrison told the Sydney Morning Herald.
Slamming the proposal, that has the backing of the opposition Labour Party, Morrison said it would lead to deaths at sea. "They will unleash a world of woe again."
Under the country’s immigration policy, those who arrive by boat have been sent to camps in Papua New Guinea and Nauru.
The Australian Parliament is expected to vote on the bill on Tuesday.

Drone, missile attack on Kyiv injures 11, damages buildings
Indian Prime Minister Modi's alliance set to easily win Bihar vote
Bangladesh on edge ahead of verdict in ousted PM Hasina's trial
France commemorates victims of deadly Paris attacks 10 years on
Afghan nationals carried out two bombings in Pakistan, says minister
