New York (CNN) Fox News hosts Chris Wallace and Shep Smith challenged President Donald Trump's comments about when and why he decided to call off a strike against Iran.

Trump said Friday that the military was "cocked and loaded" to fire on Iran in retaliation for shooting down a US drone earlier this week . But he reversed course "10 minutes before the strike" when he learned 150 people could die in the attack, the president said in a series of tweets.

Smith said Fox News' reporting found that Trump would have been given a casualty estimate at a briefing hours before that.

"Something's wrong there," Smith said about the president's comments.

Wallace also had questions.

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