In his book "Siege: Trump Under Fire," Michael Wolff captures Donald Trump's disdainful assessment of Robert Mueller, characterizing him in strong terms. Trump expressed his frustration over Mueller's investigation, particularly criticizing the findings that cleared him of conspiracy but left room for confusion regarding obstruction. This sentiment reflects Trump's belief that Mueller failed in his responsibility to deliver a clear outcome.

Wolff highlights the tension between Trump's expectations and the results of the investigation. Trump's remarks suggest that he viewed Mueller's findings as not only inadequate but potentially misleading, raising questions about the integrity of the investigative process itself. This critique underscores the broader narrative of Trump's contentious relationship with the legal inquiries surrounding him.