Philip Ruddock has been dumped as chief government whip, with the move coming just four days after a spill motion against Prime Minister Tony Abbott.
Mr Ruddock will be replaced by Queensland MP Scott Buchholz.
On Monday, Mr Abbott survived a spill against his leadership by just 12 votes, after those loyal to the PM had underestimated the number of malcontents.
Some ministers are reported to have questioned Mr Ruddock’s understanding of just how large the groundswell of resentment was.
Mr Ruddock entered parliament in 1973, making him the longest-serving member of the House of Representatives – the Father of the House.
The Prime Minister announced Nola Marino will continue in her role as government whip, while Andrew Nikolic has also been appointed government whip.
Mr Abbott praised Mr Ruddock for his “extraordinary contribution to our country, this government and the Liberal Party”.
“As Father of the House, Philip has given over four decades of service to the Australian Parliament and the Australian people,” he said.
“No one has done more than Philip helping immigrants to feel at home in their new country and helping members of migrant communities to participate in our national life.
“I look forward to his future contribution to the government and to our country.”