Nader Modanlo was facing five more years in federal prison when he got an extraordinary offer: U.S. President Barack Obama was ready to commute his sentence as part of this month's historic and then still-secret prisoner swap with Iran. He said no.

To sweeten the deal, the U.S. administration then dropped a claim against the Iran-born aerospace engineer for $10 million that a Maryland jury found he had taken as an illegal payment from Iran, according to interviews with Modanlo, lawyers involved and U.S. officials with knowledge of the matter.

The surrender of the U.S. claim, which has not previously been reported, could add to scrutiny of how the Obama administration clinched a prisoner deal that has drawn criticism from Republican presidential candidates and lawmakers.

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A Washington-based spokesman for the Justice Department declined to comment on discussions over the $10 million, which the jury found that Modanlo was paid to help Iran launch its first satellite in 2005. Modanlo says the money was a loan from a Swiss company for a telecoms deal.

In the prisoner swap, five Americans held in Iran were released at the same time as seven Iranians charged or imprisoned in the United States were granted pardons or had their sentences commuted. The deal accompanied the Jan. 16 implementation of a landmark agreement that curbs Iran's nuclear program in exchange for sanctions relief.

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