The Greens have written to the President of the Senate opposing armed guards being stationed inside both chambers of Parliament.
"More guns don't make people safer," Greens Leader Christine Milne said.
"Australians don't want militarisation of our public spaces, which includes Parliament.
"The Greens do not support firearms being carried anywhere inside the building.
"It has been a long-standing practise in the Westminster system that no arms are to be carried in the Parliament."