Trump did try to sabotage the investigation. His staff defied him. Mr. Trump began trying to get rid of Mr. Mueller, only to be thwarted by his staff. In instance after instance, his staff acted as a bulwark against Mr. Trump’s most destructive impulses.

Source: https://www.nytimes.com/2019/04/18/us/politics/mueller-report-pdf-takeaways.html?action=click&module=Spotlight&pgtype=Homepage