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The Untold Story with Martha McCallum, exclusive interviews with top newsmakers who share their inspiring

stories of perseverance, positivity, and more. Now, here's Martha McCallum. For the first time,

Iran is essentially admitting that they may have former FBI agent Robert Levinson in their custody.

A UN agency noting that according to the

statement of Tehran's Justice Department, Mr. Robert Allen Levinson has an ongoing case in the

public prosecution and revolutionary court of Tehran. Through years of escalating tensions with Iran,

from the holding and releasing of hostages held for 444 days in 1979,

to recently the members of our own military being captured for 15 hours in 2016, and then last

week the detaining of a U.N. nuclear inspector, Robert Levinson's case, has dragged on.

He is now the longest held hostage in United States history.

But now there is a $25 million reward being offered for information that leads to his return.

Incidentally, that's the same amount that was offered for now killed ISIS terrorist leader Abu Bakar Abidati.

And President Trump says that it is time to bring Levinson home.

Joining me now exclusively, Sarah Moriarty, the daughter of Bob Levinson to share her untold story.

Sarah, thank you so much for being with us today.

Thank you so much for having me.

...