In an apparent effort to test Iranian goodwill following a landmark nuclear deal, the United States on Tuesday asked Iran for help in finding an American private investigator who has been missing there for more than six years. The White House called for Iran's cooperation in locating retired Federal Bureau of Investigation agent Robert Levinson, who disappeared during a business trip to an Iranian island in the Persian Gulf in March 2007. "We welcome the assistance of our international partners in this investigation, and we respectfully ask the Government of the Islamic Republic of Iran to assist us in securing Mr. Levinson's health, welfare, and safe return," the White House said in a statement on Tuesday.

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