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Secretary of State John Kerry rejected claims that the U.S. has abandoned Robert Levinson, a U.S. citizen who has been missing in Iran for seven years.

On ABC’s This Week, Kerry said that he has personally brought up Levinson’s case with Iranian officials at the highest levels and has also discussed the issue via intermediaries.

Robert Levinson, whose family says he was working as a contractor for the CIA, claims that the U.S. has given up on the case.

“To suggest that we’ve abandoned him or that anyone has abandoned him is just incorrect,” Kerry said.