Mueller wrote: "If we had confidence . . . that the President clearly did not commit obstruction of justice, we would so state . . . we are unable to reach that judgment."
https://www.politico.com/story/2019/04/18/redacted-mueller-report-released-1280960
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A searchable version of the Mueller report can be viewed here:
https://cdn.cnn.com/cnn/2019/images/04/18/mueller-report-searchable.pdf