The ranks of top US diplomats are being depleted at a “dizzying” speed, the head of America’s diplomatic trade union has warned. Since January, the number of “two-star” minister counselors has dropped by 42% and “three-star” career ministers by 14%, according to Barbara Stephenson, president of the American Foreign Service Association (AFSA) and former ambassador to Panama. At the highest ranks of the State Department, the number of career ambassadors has dropped from five to two, after the retirement of three top diplomats. “These numbers are hard to square with the stated agenda of making State and the Foreign Service...