Speaker Nancy Pelosi Nancy PelosiPowell warns failure to reach COVID-19 deal could 'scar and damage' economy Overnight Defense: House to vote on military justice bill spurred by Vanessa Guillén death | Biden courts veterans after Trump's military controversies Intelligence chief says Congress will get some in-person election security briefings MORE (D-Calif.) on Thursday said that an airstrike that killed Iranian Maj. Gen. Qassem Soleimani was not authorized and Congress was not consulted on the decision.

“The Administration has conducted tonight’s strikes in Iraq targeting high-level Iranian military officials and killing Iranian Quds Force Commander Qasem Soleimani without an Authorization for Use of Military Force (AUMF) against Iran," Pelosi said in a statement.

"Further, this action was taken without the consultation of the Congress," she added.

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She also said the move provoked "further dangerous escalation of violence."

"We cannot put the lives of American service members, diplomats and others further at risk by engaging in provocative and disproportionate actions," the top House Democrat said.

"Tonight’s airstrike risks provoking further dangerous escalation of violence. America — and the world — cannot afford to have tensions escalate to the point of no return," she added.

Pelosi said that Congress must be briefed on the situation and be informed of the next steps that are being considered.

Secretary of State Mike Pompeo Michael (Mike) Richard PompeoThe Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep Trump's foreign policy successes confound his detractors It's time for a Jackson-Vanik Amendment for China MORE has defended the strike, saying that it was in response to "imminent threats to American lives."

He said in a CNN interview that Soleimani "was actively plotting in the region to take actions ... that would have put dozens if not hundreds of American lives at risk."

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Iran, meanwhile, has vowed “harsh retaliation."

The Pentagon announced Thursday that Soleimani had been killed.

Iraqi state TV first reported that Soleimani and Abu Mahdi al-Muhandis, the deputy commander of the Iranian-backed Iraqi militia Popular Mobilization Forces, were killed at Baghdad International Airport.