US admits draft letter suggesting troop withdrawal from Iraq was sent by "mistake"; Pompeo holds classified briefing with Senators on Iran; Bolton: I'm prepared to testify in senate trial id subpoenaed; Schiff doesn't rule out House subpoena for Bolton's

Defense Secretary contradicts Trump on targeting cultural sites, Esper: "We will follow laws of armed conflict"; Pompeo briefs Senators on Iran as he dodges questions on "imminent" threat that led to strike; Bolton willing to testify in Senate trial if subpoenaed, Romney says he'd "like to hear what he has to say"; Trump: US "a lot safer" after death of top Iranian general; Biden: We need a "president who can provide steady leadership"; Sanders: "A new war with Iran could cost thousands of lives"

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