Greek Prime Minister Alexis Tsipras staved off an immediate challenge to his premiership, though failure to appease his party’s hard-left fringe brought early elections into view. After 12 hours of talks, the central committee of the anti-austerity Syriza party decided in the early hours of Friday to hold an emergency congress in September, in which Tsipras’ move to accept a strings-attached rescue program from international creditors will be put to the vote.