Vice President Mike Pence Michael (Mike) Richard PencePence vows for law and order everywhere Trump met with chants of protest as he pays respects to Ruth Bader Ginsburg The Hill's 12:30 Report: Ginsburg lies in repose MORE said Sunday that the U.S. still doubts whether the downing of an unmanned U.S. surveillance drone had been authorized by Iran's leadership.

“The president … had doubt as to whether the downing of our unmanned aircraft was authorized at the highest levels,” Pence told CNN’s Jake Tapper Jacob (Jake) Paul TapperThe media's misleading use of COVID-19 data Julia Louis-Dreyfus: 'We can't spend much time grieving' Ginsburg Pence aide dismisses concerns rushed vote on Trump nominee will hurt vulnerable senators MORE on "State of the Union." “We’re not convinced it was authorized at the highest levels.”

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 reportedly cancelled a retaliatory strike on Iran at the last minute last week, and tweeted that he decided it would be disproportionate upon learning it would likely cost 150 lives.

“This is a president who’s always going to count the cost,” Pence told Tapper on Sunday. “The president looked at the potential loss of human life and concluded that was not proportionate.”

On Iran shooting down a US military drone, “we’re not convinced that it was authorized at the highest levels,” Vice President Mike Pence says to CNN’s @JakeTapper. https://t.co/1HsRVzyibx #CNNSOTU pic.twitter.com/Tt6dOuS3ie — State of the Union (@CNNSotu) June 23, 2019

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Pressed by Tapper on reports that Trump would have been informed of casualty estimates far earlier in the process, Pence said Trump “was provided with casualty assessments and a whole range of information throughout” but that “late in the process there were more specific projections given to him and he concluded it was not a proportionate response.”

Pence demurred on reports that he had joined Secretary of State Mike Pompeo Michael (Mike) Richard PompeoPutin nominated for Nobel Peace Prize The Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' Pompeo accused of stumping for Trump ahead of election MORE and national security advisor John Bolton John BoltonJudge appears skeptical of Bolton's defense of publishing book without White House approval Maximum pressure is keeping US troops in Iraq and Syria Woodward book trails Bolton, Mary Trump in first-week sales MORE in supporting the strikes, saying “all the national security team around the president supported providing him the broadest range of options.”

The vice president also echoed remarks Trump made in an interview aired Sunday on NBC’s “Meet the Press,” saying the U.S. would be willing to meet with Iranian officials without preconditions but that “we are not going to allow Iran to obtain a nuclear weapon.”

In a separate interview on Sunday, Pence said on CBS's "Face the Nation" that he hopes Iranians appreciate Trump's decision to call off the strike over the potential loss of life.

"I hope that sends a message to the Iranian people that while we stand firmly against the ayatollahs we have the highest hopes for the Iranian people," he said.

--This report was updated at 10:55 a.m.