Some of the week's major developments:

* Ghazi Yawer, a 45-year-old Sunni Muslim tribal sheik, was named to the largely ceremonial post of president of Iraq's caretaker government after the U.S. occupation relinquishes authority at the end of the month.

Lakhdar Brahimi, the U.N. envoy charged with forming the interim government, wanted to offer the post to Adnan Pachachi, 81, a former foreign minister and also a Sunni. But opposition from Iraqi leaders led Pachachi to turn down the job and persuade Brahimi to give it to Yawer, who has no governing experience beyond the 10 months he has served on the U.S.- appointed Governing Council. That council dissolved itself Tuesday to allow the new government to begin work immediately.

That interim government will be headed by Prime Minister Ayad Allawi, a Shiite, who was named to the job late last month. He said that "security" is the most important item on the new government's agenda. The interim government got a boost when it was tacitly recognized by Iraq's most prominent Shiite cleric, Grand Ayatollah Ali Sistani.

* National security adviser Condoleezza Rice promised Congress a full investigation into allegations that Ahmad Chalabi, an Iraqi politician supported by the Pentagon, told Iran the United States had broken the code it used for secret communications. U.S. officials said the disclosure cut off a significant stream of information about Iran when the United States is worried about the country's nuclear ambitions, its support for terrorist groups and its efforts to exert greater influence over Iraq.

Chalabi, whose exile group received more than $40 million in U.S. payments over the years, denied that he disclosed secrets to Iran, and he demanded that the Bush administration investigate the source of the leak about the investigation of him.

* The United States and Britain again revised the plan they have submitted to the U.N. Security Council for Iraq's interim government, giving it the authority to order the U.S.-led multinational force to leave the country at any time.

The latest draft resolution -- the third in less than two weeks -- also prohibits the new government from taking "any actions affecting Iraq's destiny" beyond the seven months it will be in power.

France, Russia, China -- three of the five nations on the Security Council with vetoes -- plus Germany, Chile and Algeria have all urged changes to the draft resolution, which is designed to confer legitimacy on the new interim government and the continued presence of U.S.-led foreign forces after the occupation ends June 30.