From the article: Mueller’s Reputation In Washington Is ‘Stunningly Bipartisan,’ Journalist Says
FBI Director Robert Mueller speaks at a news conference at FBI headquarters on March 9, 2007.A journalist describes Robert Mueller, pictured in 2007 when he was FBI director, as “about as apolitical and nonpartisan a figure as you could find in Washington.”
Author Garrett Graff discusses the special counsel in charge of the Trump/Russia investigation: "Bob Mueller is probably about as apolitical and nonpartisan a figure as you could find in Washington"