Chancellor Angela Merkel called on German lawmakers on Friday to back negotiations for a third Greek bailout or face chaos, saying suggestions Athens might temporarily leave the euro wouldn’t work. Merkel was addressing parliament, which is expected to vote by a clear margin for the euro zone to start talks on the new aid program even though Finance Minister Wolfgang Schaeuble has questioned whether it will succeed. Schaeuble himself has suggested that Greece might be better off taking a “time-out” from the euro zone to sort out its daunting economic problems.