President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE on Friday confirmed that the U.S. military was "cocked and loaded" to retaliate against Iran after the country shot down a U.S. surveillance drone, but backed off at the last minute.

In a series of tweets, Trump said he opted not to follow through because he felt the response would not be "proportionate" to the Iranian action. The president said he learned just 10 minutes before the strike that 150 Iranians would die, and decided to call off the mission.

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"We were cocked & loaded to retaliate last night on 3 different sights when I asked, how many will die. 150 people, sir, was the answer from a General. 10 minutes before the strike I stopped it, not proportionate to shooting down an unmanned drone," Trump tweeted.

....On Monday they shot down an unmanned drone flying in International Waters. We were cocked & loaded to retaliate last night on 3 different sights when I asked, how many will die. 150 people, sir, was the answer from a General. 10 minutes before the strike I stopped it, not.... — Donald J. Trump (@realDonaldTrump) June 21, 2019

"I am in no hurry, our Military is rebuilt, new, and ready to go, by far the best in the world. Sanctions are biting & more added last night. Iran can NEVER have Nuclear Weapons, not against the USA, and not against the WORLD!"

....proportionate to shooting down an unmanned drone. I am in no hurry, our Military is rebuilt, new, and ready to go, by far the best in the world. Sanctions are biting & more added last night. Iran can NEVER have Nuclear Weapons, not against the USA, and not against the WORLD! — Donald J. Trump (@realDonaldTrump) June 21, 2019

In an interview later Friday with NBC's "Meet the Press," Trump clarified the timeline of his decision. He said he had not yet given a final order but that planes were "ready to go" in about a half hour when he asked for a clearer explanation of potential casualties.

"I thought about it for a second and I said, 'You know what? They shot down an unmanned drone, plane, whatever you want to call it. And here we are sitting with 150 dead people that would have taken place probably within a half an hour after I said go ahead,'" Trump said. "And I didn't like it. I didn’t think it was proportionate.”

The New York Times reported late Thursday that the president had ordered a strike overnight against Iran on missile and radar sites, but pulled back.

The reversal capped a day of mounting tensions between the U.S. and Tehran, which some lawmakers fear could escalate into a conflict. The White House held a briefing with congressional leaders on Thursday afternoon, though attendees were largely mum on its contents.

Iran shot down a U.S. Navy surveillance drone late Wednesday, with the two sides disputing where it occurred. Tehran has said the drone was flying over Iranian airspace, while American officials have been adamant the aircraft was in international airspace.

Trump called Iran's action a "very big mistake," but indicated he was reluctant to escalate the situation because no Americans were killed.

“I have a feeling that it was a mistake made by somebody who shouldn't have been doing something that they did,” Trump said Wednesday during an Oval Office meeting with the Canadian prime minister. "I find it hard to believe it was intentional, if you want to know the truth."

Trump and his advisers have taken a hard line against Iran, raising the specter of conflict. The president pulled out of the Obama-era nuclear deal that offered Tehran sanctions relief for limits on its nuclear program, and the Trump administration has imposed numerous sanctions in the year since.

Trump said in his tweets that new sanctions were added "last night," but the administration has made no such announcement.

"They are a much weakened nation today than at the beginning of my Presidency, when they were causing major problems throughout the Middle East," Trump tweeted Friday. "Now they are Bust!"

But the president has sought to balance the increasing potential to engage Iran militarily with his campaign pledge to disengage the U.S. from foreign conflicts by saying in recent weeks he hopes Iranian officials will want to talk. Trump has also appeared to downplay some recent episodes involving Tehran.

After the U.S. blamed attacks last week on two oil tankers on Iran, Trump said he viewed it as "very minor." And on Thursday he called the shoot-down of the U.S. drone a "mistake," even as Iranian officials were clear they took deliberate action.

Iranian officials have shown no interest in coming to the table thus far, arguing the U.S. can't be trusted. The two countries have no formal diplomatic channels.

--Updated June 21 at 1:37 p.m.