Special Counsel Robert Mueller found significant evidence that Donald Trump may have obstructed justice, but he declined to charge him based on his view of how the law should work. In a 400-page report sent to Congress Thursday, the former FBI director spelled out a view of the constitutional limitations placed on prosecutors which guided his decision-making in not charging Trump. At the same time, he plainly stated that if he could have said that Trump was innocent of obstruction of justice, he would have done so. “The evidence we obtained about the President’s actions and intents present difficult issues that prevent us from conclusively determining that no criminal conduct occurred,” Mueller wrote.