* Bolton charged with 18 counts of violating Espionage Act * Bolton accused of discussing confidential information with two relatives for his memoir * Investigation into Bolton opened in 2022 * Court hearing in case scheduled for November 21 (Adds link to related analysis, bullet points) By Sarah N. Lynch and Jack Queen GREENBELT, Maryland, Oct 17 (Reuters) – John Bolton, the national security hawk and former adviser to Donald Trump who has become one of the U.S. president's biggest critics, pleaded not guilty on Friday to charges of mishandling classified information. Bolton, who was indicted on Thursday, is the third of Trump's prominent critics to face prosecution in recent weeks, as the U.S. president dispenses with decades-long norms designed to insulate federal law enforcement from p

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