MADRID, Spain — Prime Minister Jose Luis Rodriguez Zapatero's 16 Cabinet ministers took their oath of office Sunday, completing Spain's new Socialist government.

The ministers were sworn in at a ceremony at the Zarzuela Palace, the residence of King Juan Carlos, reading the same one-line oath that Zapatero had recited on Saturday.

Fulfilling a campaign pledge, Zapatero has divided the Cabinet posts evenly between men and women. Their first meeting is scheduled for Monday.

The key post of foreign minister went to Miguel Angel Moratinos, a career diplomat and former European Union envoy to the Middle East.

Moratino's first task will be to address U.S. concerns over Zapatero's plans to withdraw the 1,300 Spanish troops in Iraq by June 30 unless the United Nations takes over political and military control of the occupation.

The Spanish newspaper ABC reported Saturday that Moratinos will travel Tuesday to Washington to discuss the dispute with Secretary of State Colin Powell and National Security Adviser Condoleezza Rice.

Only one minister has cabinet experience: Finance and Treasury Minister Pedro Solbes, who held that same post in the Socialist government that ruled Spain from 1993-1996. He is credited with taking the first steps to prepare Spain's economy for Europe's single currency, the euro.

Prior to his new post, Solbes was the European Union's commissioner for economic and monetary affairs.

Zapatero, whose party prevailed in March 14 general elections overshadowed by the Madrid terror attacks, won parliamentary backing as prime minister on Friday.

With 164 seats in the 350-seat Congress of Deputies, his Socialist party fell 12 seats short of a majority in the election. But small, mainly regional parties holding a total of 19 seats gave Zapatero the necessary cushion.

Still, he will lead a minority Socialist government, not a coalition.

As the Cabinet posed Sunday for an official photograph, Defense Minister Jose Bono switched at the last minute to the other side of the group.

When someone called out that he was "drifting over to the right-wing," he quipped: "That depends which side you are watching from."