washington federal watchdog say friday review circumstances surround u.s. treasury secretary steven mnuchin controversial flight last month kentucky speak business leaders view solar eclipse respond inquiries receive members public review circumstances secretary august 21 flight louisville ft. knox determine whether applicable travel ethics appropriation laws policies observe rich delmar counsel treasury office inspector general say statement mnuchin former hedge fund manager wife actress louise linton travel u.s. government plane kentucky view aug. 21 solar eclipse senate majority leader mitch mcconnell others linton post photo social media get plane list designer brand wear trigger criticism display wealth privilege washington post first report review say democratic senator ron wyden last week request detail explanation travel justification use government aircraft independent watchdog group citizens responsibility ethics washington also seek record trip say seem plan enable mnuchin site view total eclipse eclipse visible washington obscure 80 percent sun post say treasury secretaries cabinet members involve national security traditionally fly government aircraft rare occasion usually take commercial flight domestic travel treasury officials say trip official government travel mnuchin speak louisville business leaders visit fort knox large portion u.s. gold reserve hold delmar say office inspector general look various issue raise flight review complete advise appropriate officials accordance inspector general act establish procedures say statement treasury watchdog review mnuchin 's solar eclipse trip