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Mustafa Abushagur, who has known Mr. el-Keib for almost 40 years and taught with him at the University of Alabama, described the new prime minister as “a first-rate educator and natural leader.”

“He is a natural team player. He is very passionate about serving his country,” Mr. Abushagur said.

Meanwhile, NATO officially concluded its mission in Libya on Monday.

Senior council officials, including Mr. Abdel-Jalil, the chairman, had sought an extension of the NATO mission saying pro-Gadhafi fighters still pose a threat to Libya’s internal security.