Protesters waving Palestinian flags have rallied outside the ABC's Parramatta studios before a debate between Anthony Albanese and Peter Dutton.
The pair are going head-to-head again in the second showdown of the election campaign, hosted by the public broadcaster on Wednesday evening.
Security measures were bolstered in advance of the protest.
About 70 people turned out, many wearing keffiyehs around their shoulders, a traditional Arab garment that has become a symbol associated with Palestinians.
They chanted "Albanese you have blood on your hands" and "Free, free Palestine".
Banners included messages "Albo and Dutton stop the genocide" and "being anti-Palestinian is anti-Semitic".
A dozen police lined the entrance to the building, and comes after a number of confrontations between activists and the two leaders.
The prime minister was confronted inside his hotel on Tuesday in the latest incident during the campaign.
It is the second debate to be held in western Sydney, where many political analysts believe the election could be decided.
Mr Albanese was declared the winner of the first, broadcast by Sky News.
Labor is facing backlash from voters in some of its electorates in NSW and Victoria, from large Muslim communities angry over the government's position on the Israel-Gaza war.
Muslim Votes Matter, an advocacy group, has backed independents running in the western-Sydney seats Blaxland and Watson, which are held by Labor ministers Jason Clare and Tony Burke.
The prime minister and opposition leader will face off for the third time next Tuesday on Nine, and for the final time on Seven, during the week of the May 3 election.
