Peter Dutton's plans to radically redefine citizenship are anti-immigration and will destabilise thousands of families, Greens Immigration spokesperson Nick McKim says.

"There are thousands of people who are working, studying and raising families in Australia who will have their lives destabilised," Senator McKim said.

"These are men, women and children who are proud to be in this country, but now face roadblocks because of Peter Dutton's anti-immigration agenda."

"Peter Dutton is trying to remake Australia in his own narrow-minded and fearful image."

Settlement in the Manus Island class action is an admission by Peter Dutton that he is responsible for the illegal detention and deliberate harm of people seeking asylum in Australia, Greens Immigration spokesperson Nick McKim says.

"These 1900 men who sought safety in Australia have lost their freedoms, their families and their futures because of Peter Dutton's decisions," Senator McKim said.

"No amount of money can compensate for this."

Peter Dutton's proposed citizenship changes are xenophobic, unfair and must be rejected by Labor, Greens Immigration spokesperson Nick McKim says.

"Time and again we have seen Peter Dutton grabbing more power for himself, as he tries to make himself judge, jury and jailor," Senator McKim said.

"Peter Dutton has repeatedly shown he cannot follow the current laws - now he wants to get rid of the right of the courts to correct his unlawful decision."

"This a draconian measure aimed at undermining multicultural Australia."

The Department of Immigration and Border Protection has finally started to concede facts about the Good Friday shooting attacks at the Manus Island Detention Centre.

"Today the department finally conceded that nine people were injured in the attacks, that multiple firearms were used, and that shots were fired directly into the centre," Greens spokesperson for immigration Senator Nick McKim said.

"The Department has known this for some time, but has refused to correct its own erroneous statements."

Peter Dutton placing unreasonable deadlines on claims for asylum is an attack on some of Australia's most vulnerable people and undermines natural justice and the rule of law, Greens Immigration spokesperson Nick McKim says.

"By setting an arbitrary deadline Mr Dutton is deliberately setting desperate people up to fail," Senator McKim said.

"There is simply not enough time for 7500 people to receive the legal advice they need and submit their applications on time."

Documents showing a plan to make conditions worse for people in Australia's Manus Island detention centre are proof that the torture of innocent people seeking asylum is Australian government policy.

"Punishing people and subjecting them to degradation to coerce an outcome fits squarely within the definition of torture," Greens Immigration spokesperson Nick McKim said.

"The Australian government, and the private contractors it has employed, are in clear breach of their legal and moral obligations."

The Australian government is preparing to completely wash its hands of the men it has detained for four years on Manus Island.

"After four years of hell overseen by the Australian government, these men have now have to make an impossible choice," Greens Immigration spokesperson Nick McKim said.

"The walls of the detention centre were the only thing between asylum seekers and heavy gunfire last month – now Peter Dutton wants to knock down the walls."

Amnesty International's report on the Manus Island shooting and concessions from PNG police have made clear Peter Dutton's catastrophic failure to keep people safe as well as his disgraceful dishonesty.

"The report and PNG police have made it clear that bullets were fired upon the detention centre, contrary to Dutton's claims," Greens Immigration spokesperson Nick McKim said.

"People in his care are being shot at and he has not lifted a finger to keep them safe. This is an appalling act of neglect."