The Mueller report presented substantial evidence that might have led to an obstruction charge. Indeed, Mueller concluded that the scope and nature of the evidence foreclosed exonerating the president. Yet Mueller declined to charge Trump with obstruction – not for lack of evidence, but because Justice Department policy barred indictment of a sitting president.
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As noted, Mueller proffered significant evidence of obstruction by Trump. It was Barr, but not Mueller, who decided that the evidence was insufficient to charge Trump.
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Mueller concluded that the Russians did interfere, Trump was aware of the interference, he benefited from and encouraged the interference – e.g., Don, Jr. was eager to get and use information on Hillary Clinton – and he didn’t report the interference to the FBI.