Dr. Brian Monahan, the private doctor to lawmakers on Capitol Hill, resigned amid a military investigation of his office for a toxic work environment as well as staff complaints, including being ordered to cut lawmakers’ toenails as part of their medical duties. The Office of the Attending Physician of the Capitol, a nondescript set of rooms hidden in the basement of the historic building, dispenses discreet medical care to members of Congress, their staff, and Supreme Court justices. The office has always been led by a Navy physician. Monahan, who had held the post since 2009, is a two-star admiral....