He counts NSW Premier Gladys Berejiklian as a friend and political ally, but that has not stopped Trent Zimmerman, the federal Liberal member for North Sydney, from criticising her government.

Speaking at the opening of Sub Base Platypus, Mr Zimmerman compared the state government’s management of land around Sydney Harbour unfavourably with the federal government through its Sydney Harbour Federation Trust.

Trent Zimmerman, the federal Liberal member for North Sydney, did not speak highly of the state government's management of land around Sydney Harbour. Credit:Nick Moir

“Without wanting to pick a fight with the state government, historically if you went to the border of the trust land and went into the Sydney Harbour National Park, I think the weed count would probably increase dramatically," he said.

A waterfront park and pedestrian bridge linking it to Kesterton Park and the North Sydney ferry stop was unveiled by Mr Zimmerman on Tuesday as part of the redevelopment of the former HMAS Platypus submarine base and torpedo factory on Neutral Bay that has been renamed Sub Base Platypus.