Three Labor MPs have broken ranks on Australia's plan to acquire nuclear-powered submarines, raising concerns about where waste will be stored.
Fremantle MP Josh Wilson says he isn't completely convinced about whether Australia needs the new submarines.
"I'm not completely convinced that nuclear-propelled submarines are the only or best answer to our strategic needs," he told parliament on Monday, noting he wasn't privy to private security briefings.
"The AUKUS agreement, arrived at with some characteristically questionable secrecy by the former government ... is not a sports team of which we have all suddenly become life members."
Labor MPs Libby Coker and Michelle Ananda-Rajah have also reportedly raised concerns about the deal in a caucus meeting on Tuesday.
Former Labor prime minister Paul Keating sparked controversy when he came out against the agreement in a scathing National Press Club address, sparking speculation about an internal rift within Labor.
Prime Minister Anthony Albanese last week said in an interview the caucus had been "taken through this process".
He has also said he hadn't heard any opposition raised from within his own party, when asked if there had been pushback from anyone in the national security sphere or parliament.
When the original AUKUS decision was made by the coalition government, it was put to the shadow cabinet and caucus and received the "total support of the Labor team", he has said.
At least one local Labor branch has passed a resolution calling for the withdrawal from the AUKUS agreement.