Australian Prime Minister Malcolm Turnbull survived a leadership challenge by Home Affairs Minister Peter Dutton on Tuesday, government officials said, but the narrow margin of his win did little to dampen speculation about his future.

Turnbull defeated Dutton 48-35 in the party-room vote for the leadership of the Liberal Party, the senior party in the centre-right government coalition, officials said. The vote came after a sharp fall in opinion poll ratings and talk of a challenge that have raised the possibility of an early election.

Seeking to safeguard his leadership, Turnbull called on his party to back him or risk losing the next election to the opposition Labor party.