A government minister has joined calls for the State Services Commissioner to be sacked, over his handling of the Roger Sutton resignation.

United Future leader Peter Dunne says Iain Rennie has performed very poorly.

Mr Dunne wants Mr Rennie replaced by a "more vibrant, independent leadership" that's not "politically beholden" to the government.

Peter Dunne says a fit-for-purpose State Services Commission should focus its attention on Mr Sutton's victims, and sexual harassment elsewhere in the public sector.