The Mueller report clearly states that attempts by President Trump to obstruct the investigation failed because others refused to “carry out orders or accede to his requests.”

From the report: “Comey did not end the investigation of Flynn, which ultimately resulted in Flynn’s prosecution and conviction for lying to the FBI. McGahn did not tell the Acting Attorney General that the special counsel must be removed, but was instead prepared to resign over the President’s order. Lewandowski and Dearborn did not deliver the President ‘s message to Sessions that he should confine the Russia investigation to future election meddling only. And McGahn refused to recede from his recollections about events surrounding the President’s direction to have the special counsel removed, despite the President’s multiple demands that he do so.”

“Consistent with that pattern, the evidence we obtained would not support potential obstruction charges against the President’s aides and associates beyond those already filed.”