The case against Trump for trying to hinder the investigation was far different. The prosecutors thought they had rock-solid evidence of obstruction of justice. There was no question in their minds that the president sought to thwart investigators and if anything was saved only by advisers like Don McGahn who refused to go along. But the Justice Department’s long-standing policy, formulated under one president facing impeachment (Richard Nixon) and reaffirmed under another (Bill Clinton), held that a sitting president could not be indicted for a crime while in office. Although that opinion was
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