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Jason Rezaian, Washington Post reporter and one of the U.S. citizens recently released from detention in Iran, poses to media outside the Emergency Room in Landstuhl, Germany, January 20, 2016. Image Credit: Reuters

Washington: The US acknowledged that it waited for Iran to release American prisoners before delivering $400 million (Dh1.4 billion) in cash that it owed the country, but again insisted the payment was not ransom.

Republicans including Donald Trump pounced on Thursday’s admission as proof that President Barack Obama’s government had misled the American people.

“With concerns that Iran may renege on the prisoner release ... we, of course, sought to retain maximum leverage until after American citizens were released,” State Department spokesman John Kirby told reporters.

“That was our top priority,” he said.

In January, five American prisoners were released as Washington granted clemency to seven Iranians and withdrew arrest warrants for 14 others.

Immediately thereafter, the US helped airlift $400 million worth of Swiss francs and euros to Iran.

The US government insists that money was meant to settle an old debt stemming from a military purchase by Iran.

The money was delivered on January 17, just one day after a landmark nuclear deal between Tehran and world powers took effect.

“We were able to conclude multiple strands of diplomacy within a 24-hour period, including implementation of the nuclear deal, the prisoner talks and a settlement of an outstanding Hague tribunal claim,” Kirby said, referring to the money claimed by Iran.

“It’s already publicly known that we returned to Iran its $400 million in that same time period as part of The Hague settlement agreement,” he said.

In early August, the State Department had said the prisoner release and delivery of money were completely separate issues, although Kirby acknowledged on Thursday that the two were in fact related.

“I’m saying that the events came together simultaneously ... it would have been foolish, imprudent, irresponsible for us not to try to maintain maximum leverage,” Kirby said.

The ordeal has set off a tidal wave of condemnation from Republicans, who have questioned the timing of the two events, and said the government paid ransom for the prisoner release.

Trump's attack

Republican presidential Trump was quick to attack.

“Speaking of lies, we now know from the State Department announcement that President Obama lied about the $400 million dollars in cash that was flown to Iran,” he told a rally in Thursday in North Carolina.

“He denied it was for the hostages, but it was. He said we don’t pay ransom, but he did. He lied about the hostages — openly and blatantly,” Trump said.

Trump’s opponent in the race for the White House, former secretary of state Hillary Clinton, was no longer serving as the nation’s top diplomat when the accord came into effect.

Still, Trump senior communications adviser Jason Miller said that “by helping put together a deal that ultimately sent $400m to Iran that was likely used to fund terrorism, Clinton has proven herself unfit to be president of the United States.”

House speaker Paul Ryan said Obama had set a dangerous precedent.

“Today the State Department admitted what we’ve long suspected — that the president and his administration have been misleading us since January about whether he ransomed the freedom of the Americans unjust[ly] imprisoned in Iran,” America’s top elected Republican said.

“The president owes the American people a full accounting of his actions and the dangerous precedent he has set,” Ryan added.