The national government needs to cut the Cabinet and streamline Parliament, Cape Town Mayor Patricia de Lille said on Friday.
This follows President Jacob Zuma's State of the Nation Address on Thursday, in which he raised the possibility of moving Parliament to Pretoria.
De Lille said the issue was not about moving Parliament to Pretoria to cut government wastage. "The key issue is that government is too big," she said.
"National government needs to cut the Cabinet, [and] streamline and rationalise Parliament in order to save costs to the taxpayer, and work more efficiently."
She said regardless of the possible move, the City of Cape Town "would always be open to the people of Gauteng".
During his speech, Zuma said maintaining two capitals - a legislative one in Cape Town and an administrative one in Pretoria - was a big expenditure item. MPs required two houses and two cars, among other expenses.
He said the matter required the attention of Parliament soon.