Australian Prime Minister Malcolm Turnbull said Thursday he would step down if a majority of lawmakers in his center-right party call for a leadership vote, as a struggle in the ruling coalition over policy direction appeared to be drawing to a showdown.
His announcement comes as Peter Dutton, a populist who has campaigned on border protection, canvasses colleagues within the ruling Liberal Party—the country’s main conservative bloc—in his second attempt in a week to unseat Mr. Turnbull.
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