US Republican presidential nominee Donald Trump has backtracked on a claim that he saw video footage of a US cash payment to Iran.
He made the claim at a rally. His team admitted it was incorrect, only for Mr Trump to repeat it at another rally.
The money was paid at the same time US hostages were freed, but the president said it was a payment linked to the landmark Iranian nuclear agreement.
Mr Trump said the video he saw was of the hostage transfer, not the payment.
The White House announced in January it was making payments to Iran – a total of $1.7bn (£1.3bn) to settle a decades-old dispute over a failed military equipment deal – as part of the nuclear accord.
A newspaper this week revealed that $400m of that was delivered in cash, flown to Iran at roughly the same time as four Americans were released in a prisoner exchange.
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The timing of the transfer brought attacks from Republicans, including Mr Trump.
President Barack Obama denied any connection between the cash and the prisoner swap, saying: “We do not pay ransom for hostages.” He said the payment had to be in cash because strict financial sanctions precluded other methods.
However, the BBC’s Barbara Plett Usher in Washington says it did not help that Iranian defence officials had described the money as a ransom payment.
Mr Trump insisted on Wednesday he had seen video showing the money being delivered.
His team on Thursday acknowledged this was not the case, saying Mr Trump was referring to cable news file footage of hostages being released.
But Mr Trump repeated his claim at another rally later on Thursday.
On Friday, his tweet was echoing the campaign team, saying: “The plane I saw on television was the hostage plane in Geneva, Switzerland, not the plane carrying $400 million in cash going to Iran!”
Donald Trump has had a difficult week. His rival, Hillary Clinton, has seen a significant opinion poll boost since the Democratic convention.
He has also run into trouble by rowing with the parents of a Muslim US army captain who was killed in Iraq and was criticised for calling Mrs Clinton “the devil”.
A number of high-profile figures, including Republicans, have come out against him.
Republican Congressman Mike Coffman was one to air an anti-Trump advertisement.
Former director of the CIA, Michael Morell, not affiliated to either party, said in the New York Times that he would “do everything I can to ensure [Mrs Clinton] is elected our 45th president”.
Key national security figure endorsements
Endorsed Mrs Clinton
- Gen John Allen, retired
- Richard Armitage, former deputy secretary of state (Republican)
- Gen Wesley Clark, retired, former head of Nato
- Michael Morell, former CIA director
- Leon Panetta, former defence secretary
- Adm James Stavridis, retired, former head of Nato
- Brent Scowcroft, former national security adviser (Republican)
Not voting for Mr Trump
- William Cohen, former defence secretary (Republican)
- Michael Hayden, former CIA director (Republican)
On Thursday, Republican House Speaker Paul Ryan told fundraisers the party had to protect its majority in Congress or “we could be handing President Hillary Clinton a blank cheque”.
It echoed the “Let’s not give Clinton a blank cheque” phrase used by Republicans in 1996 when it became clear Bob Dole would not defeat Bill Clinton.
However, Mr Trump’s running mate, Mike Pence, stood firmly behind him on Friday, telling NBC: “Donald Trump and I are standing shoulder to shoulder to say to the American people, ‘we can be strong again’.”