Mueller investigation cost
Co-authors:

There have been many reports that the Mueller (Special Counsel) Investigation cost the taxpayers many millions of dollars. What is the best available information about its cost?

Robert Mueller
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Did the Mueller Report describe suffcient evidence to support an Obstruction of Justice indictment against the president or anyone in his 2016 presidential campaign? Attorney General Bill Barr wrote a summary letter regarding the report, stating that there was insufficient evidence to support such an indictment. Robert Mueller responded to that summary letter by writing his own letter to Attorney General Barr, stating that Barr had not fully captured the "content, nature, or substance" of his report.

Trump and Mueller
Co-authors:
Donald Trump expressed concern that the Mueller investigation was biased against him because there were 13 Democrats (either registered as Democratic, or donated to Democratic Party candidates) and no registered Republicans among its investigators. Are these concerns reasonable?