Donald Trump has warned reporters from an unnamed media organisation to give up the name of the person who he claims gave them information on US military personnel missing in Iran - or face jail.
Speaking in a White House news conference, the US president said Iran did not know a second service member was missing until the information was published in the US media.
He was giving more details about the operation to rescue two US F-15 crew members after their plane was shot down in Iran.
"We think we'll be able to find it out," Mr Trump said.
"Because we're going to go to the media company that released it, and we're going to say, 'National security, give it up or go to jail.'"
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