Story highlights The former FBI director delivered the commencement address at Tabor Academy

Mueller urged students to value integrity

Marion, Massachusetts (CNN) Justice Department special counsel Robert Mueller, who is leading the Russia investigation, extolled the importance of integrity in a commencement address Monday afternoon, telling graduates "nothing else matters" if you aren't honest.

The former FBI director was speaking at Tabor Academy, a small boarding school in Marion, Massachusetts, on the shores located near Cape Cod. His speech on Monday was his first public appearance since being named special counsel.

Mueller's granddaughter was one of the 133 graduates and she delivered the introduction for Mueller, describing him as a positive role model who cherished his public service.

Mueller did not mention the Russia investigation, but the schoolmaster joked before his address that Mueller has "a few things going on" right now and thanked him for making time for the speech.

He urged students to value integrity.

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