Story highlights Dan Levinson said the family realizes time is of the essenceLevinson was not among five American hostages that Iran released in JanuaryWatch CNN's Erin Burnett's full interview with the Levinson children Sunday at 10 a.m. New York (CNN) Two children of the longest-held hostage in American history are hoping a series of meetings this week in Washington will renew efforts to find their father nearly 10 years after he disappeared in Iran. The family of Robert Levinson, a retired FBI agent -- and, according to his family, a CIA contractor -- met with Secretary of State John Kerry, members of Congress and top aides to President Barack Obama at the White House, including National Security Adviser Susan Rice. In an exclusive interview with CNN's Erin Burnett on "Outfront," Dan Levinson said White House officials "told us that they are working on the case, and they are not going to rest until he is home safe to us." Levinson said the family realizes time is of the essence since there will be a new administration in January.

Source: CNN September 17, 2016 01:07 UTC