Although Kelly was not serving as Trump's chief of staff during the time he fired former FBI Director James Comey, Mueller's team nonetheless wanted him to answer some questions about what he remembered about key events surrounding the firing.
The officials confirmed the decision Friday on condition of anonymity because it had not been announced.
Kelly is expected to be replaced with Nick Ayers, who is now chief of staff to Vice President Mike Pence.
Trump also announced that State Department spokeswoman Heather Nauert is his pick to replace Nikki Haley as the next USA ambassador to the United Nations, and he said he'd have another announcement Saturday about the military's top brass.
USA officials say President Donald Trump will nominate the Army chief of staff, Gen. Mark Milley, as his next top military adviser. But there is a holiday senior staff dinner scheduled for Friday night and people said they expected Kelly to be there. Bolton had criticized Department of Homeland Security Secretary Kirstjen Nielsen during an Oval Office discussion about the border, and Kelly stormed out of the West Wing after their profanity-laced argument spilled over into the hallways. The two have reportedly stopped speaking in recent days.
Kelly, too, has made no secret of the trials of his job and has often joked about how working for Trump was harder than anything he'd done before, including on the battlefield.
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