During a briefing at the White House, President Donald Trump railed against an alleged leak to the media about the downed U.S. fighter jet, threatening to have the journalist jailed.

“They put this mission at great risk. They put that man at great risk, and they put the hundreds of people that went in looking for him, because everyone now knows that we're going in,” Trump claimed.

The president emphasized the need to uncover whomever “leaked” such information.

“We have to find that leaker because that's a sick person. Probably didn't realize the extent of how bad it was. I can't imagine that the person did. But we're going to find out. It's national security, and the person that did the story will go to jail if he doesn't say, and that doesn't last long,” Trump said.

-ABC News' Fritz Farrow, Allie Pecorin and Emily Chang

When the injured airman who was shot down “was finally able to activate his emergency transponder, his first message … [said] ‘God is good,’” Secretary of Defense Pete Hegseth said during a briefing at the White House.

“In that moment of isolation and danger, his faith and fighting spirit shown through,” he said. “Shot down on a Friday, Good Friday, hidden in a cave, a crevice all of Saturday, and rescued on Sunday. Flown out of Iran as the sun was rising on Easter Sunday.”

A U.S. fighter jet with two airmen on board was shot down over Iran on Friday, and the jet’s pilot was rescued the same day. The U.S. launched a search for the second missing airman who was trapped in the "treacherous mountains of Iran" with the Iranian military closing in, President Donald Trump said. That airman was rescued on Sunday.

Trump said the rescued airman “was injured quite badly and stranded in an area teeming with terrorists.”

“Despite the peril, the officer followed his training and climbed into the treacherous mountain terrain and started climbing toward a higher altitude,” Trump said. “He scaled cliff faces, bleeding rather profusely, treated his own wounds, and contacted American forces to transmit his location.”

President Donald Trump said the U.S. is “doing unbelievably well” in Operation Epic Fury and “at a level that nobody's ever seen before."

“The entire country can be taken out in one night, and that night might be tomorrow night,” he said of Iran during a briefing at the White House.

When asked about the apparent incongruency between his repeated claims that Iran had no anti-aircraft equipment and the downing of two U.S. jets, President Donald Trump said Iran “got a little bit lucky.”

“You know what? When you do thousands and thousands of flights and you have one plane shot down and not mortally, the two pilots got out, they got a little bit lucky,” Trump said.

The president was pressed on why the U.S. remains at war when he has repeatedly said Iran has been “obliterated.” While continuing to claim that Iran is unable to fight back, Trump also said they have “some” missiles and drones left.

"It’s a big country. They can't fight back. They have no capability. I mean, they'll have -- they have some missiles left. They have some drones left, but essentially they have no capability," he said. "They had a lucky shot with an airplane, but we got them back out."

-ABC News’ Emily Chang, Justin Gomez and Fritz Farrow