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Steinmeier played a central role in encouraging the SPD to reverse its pledge to go into opposition. Thursday's meeting will include Merkel, SPD leader Martin Schulz and Horst Seehofer, leader of the Christian Social Union (CSU), the sister party to Merkel's Christian Democrats (CDU).
Schulz on Friday announced his centre-left party would help form a new government led by Merkel to avert a disruptive repeat election in Europe's economic and political powerhouse, but said party members would have the final say on any deal.