Speaker Nancy Pelosi Nancy PelosiPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Trump signs largely symbolic pre-existing conditions order amid lawsuit MORE (D-Calif.) on Friday emphasized that U.S. military action against Iran "must not be initiated" without congressional approval, after 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 approved and then reversed a decision to strike Iran over the downing of a U.S. drone this week.

Pelosi told reporters that she was not notified by officials of the president's decision on Thursday to approve the military strike when she and other congressional leaders went to the White House for a briefing that day.

“We left with the idea that the president was going to consider some options,” Pelosi told reporters on Friday. “I did not receive any heads-up that there was a strike that was in the works.”

“Maybe the other leaders did on the Republican side, but I did not receive any of that,” she added.

House Speaker Nancy Pelosi says she "did not receive any heads-up" on any Iran strike https://t.co/08sykXtKte pic.twitter.com/UQ42Gxmsf0 — CNN Politics (@CNNPolitics) June 21, 2019

Senate Democratic Leader Charles Schumer Chuck SchumerPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' 3 reasons why Biden is misreading the politics of court packing Cruz blocks amended resolution honoring Ginsburg over language about her dying wish MORE (N.Y.) said Thursday that Democrats told Trump in a Situation Room meeting that he needs to get congressional authorization before taking military action.

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Trump said Friday that officials had been "cocked and loaded" to retaliate against Iran after he learned an Iranian missile system shot down a U.S. military drone that Iranian officials argued entered the country's airspace, a claim U.S. officials have refuted.

However, the president said he decided to call off the mission after he learned 150 Iranians would die as a result of the retaliatory strike.

"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.

Iranian officials said that the president warned them that an attack was imminent and that they were informed of the planned attack a "short period" before it was initially scheduled to be carried out.

“In his message, Trump said he was against any war with Iran and wanted to talk to Tehran about various issues,” one Iranian official said.

In either case, Pelosi emphasized to the Trump administration in a statement that “hostilities must not be initiated without the approval of Congress.”

“During our meeting with the President at the White House, Congressional Leaders stressed the necessity that we work with our allies and not strengthen the hand of Iran’s hardliners,” she said.

“We have no illusions about the dangerous conduct of the Iranian regime,” she added. “This is a dangerous, high-tension situation that requires a strong, smart and strategic approach.”