The federal government has called a three-month national gun amnesty, the first since the Port Arthur massacre in 1996.
"The aggression from the gun industry is extraordinary", she said.
Australian police talk outside a bar as they investigate whether live firearms were used in the filming of a music video during which an actor was fatally wounded in the chest in Brisbane January 23, 2017.
Government frontbencher Christopher Pyne said if illegal guns were not available, Queensland police officer Brett Forte would not have been killed on May 29.
"The fact [is] we've got a deteriorating national security environment", Mr Keenan told ABC radio.
He said illegal guns had been used in some of the terror attacks in Australia in recent years, including the 17-hour-long Lindt Cafe siege in 2014 by a radicalised self-proclaimed cleric.
But five have taken place, mostly with guns, including a fatal shootout in Melbourne this month claimed by the Islamic State group.
Gun owners will be allowed to hand in their firearms at specified locations with "no questions asked and with no penalty".
Deputy AG Rod Rosenstein testifies in budget hearings
Sekulow emphasized he thought it "completely conjecture and speculative, and I can not imagine that the issue would arise". Comey also testified he had told Trump he was not under investigation.
People caught with unregistered firearms outside of the amnesty period could face fines of up to $280,000 or a jail sentence of up to 14 years.
Then-Prime Minister John Howard responded with tough new gun laws, including banning all semi-automatic weapons.
Gun control measures continue to have strong public support in Australia.
Speaking to Channel 9, President Leavers says it won't work without sweeteners, like a buy back offer.
No money is on offer this time and Keenan admitted many hardened criminals were unlikely to hand in their weapons.
"If people don't take that opportunity, the penalties for owning an unregistered or illegal gun in Australia are very severe".
Justice Minister Michael Keenan said the amnesty was due to begin on July 1.
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