Attorney-General Christian Porter will become Leader of the House when federal parliament reconvenes.
Mr Porter said Prime Minister Scott Morrison made the decision prior to the federal election, after Christopher Pyne announced his retirement.
“That is an important and vital role to the functioning of parliament,” he told reporters in Perth on Monday.
“I’d like to see that role executed in a way that is as collegiate as possible and makes for a parliament that is cooperative and works as well as it can do in the interests of the Australian people.”
Mr Porter will stay on as attorney-general.
He was expected to come under pressure to retain his seat of Pearce from Labor’s Kim Travers, but Mr Pearce actually increased his margin by 3.2 per cent with 70 per cent of the vote counted.