The Liberal Party fractured in August when a backbench revolt forced then prime minister Malcolm Turnbull from office.
Scott Morrison was sworn in as the country's 30th leader late on Friday after a bitter Liberal Party revolt against moderate Malcolm Turnbull.
Treasurer Scott Morrison will become Australia's new prime minister after winning a Liberal party leadership vote on Friday, ending an internecine battle that has scarred the conservative government ahead of an election due by May 2019.
Malcolm Turnbull, whose coalition holds a razor-thin majority of just one seat, said on Thursday that Barnaby Joyce had shown a "shocking error of judgment" for conducting an affair.
A citizenship crisis that robbed Australian Prime Minister Malcolm Turnbull of his one-seat majority will claim another politician, with the Senate president on Wednesday saying he will resign after confirming he was a dual national.
Early counting in Australia's national election showed a sizeable swing to the opposition Labor Party, bolstering fears a close vote will deny current Prime Minister Malcolm Turnbull the outright majority he needs to enact major economic reforms.
Australian Prime Minister Malcolm Turnbull's popularity has fallen, just over a month before what is expected to a closely fought election, an opinion poll published on Saturday showed.