President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE authorized the killing of Gen. Qassem Soleimani last summer if an American was killed as the result of increased Iranian aggression, NBC reported Monday, citing five current and former senior administration officials.

Officials told the network that then-national security adviser John Bolton John BoltonDiplomacy with China is good for America The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep DOJ launches probe into Bolton book for possible classified information disclosures MORE urged Trump to retaliate for Iran downing a U.S. drone in June by approving an operation to kill Soleimani. The officials also said that Secretary of State Mike Pompeo Michael (Mike) Richard PompeoHillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers Treasury Dept. sanctions Iranian government-backed hackers The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep MORE backed the decision to kill Soleimani at the time.

Trump said that he would only take action if Iran killed an American, a person briefed on the discussion told NBC.

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The report brings into question the Trump administration's justification for killing Soleimani in a drone strike earlier this month after an attack in which a U.S. contractor died. Administration officials have claimed that killing the top Iranian commander was necessary due to an imminent threat of attacks Soleimani was plotting.

Critics of the decision have questioned how imminent the attacks were. Democrats widely condemned the attack, and many members of Congress claimed the intelligence did not support the decision, based on information they were briefed on.

“There have been a number of options presented to the president over the course of time," a senior administration official told NBC. The official added that it was “some time ago” that presidential aides put killing Soleimani on the list of potential responses to Iranian aggression.

The idea of killing Soleimani came up in 2017 during conversations then-national security adviser H.R. McMaster was having with administration officials about Trump’s broader national security strategy, officials told NBC. The idea was reportedly one of possible elements of a “maximum pressure” campaign against Iran and “was not something that was thought of as a first move,” a former senior administration official involved in the discussions said.

It reportedly became a more serious idea under Bolton, who replaced McMaster in April 2018.

A spokesperson for the White House did not immediately respond for comment when contacted by The Hill Monday morning.

--This report was updated at 10:06 a.m.