diplomatic corps
noun /ˌdɪpləˈmætɪk kɔː(r)/
  /ˌdɪpləˈmætɪk kɔːr/
 (usually the diplomatic corps)
 [countable + singular or plural verb] (plural diplomatic corps)
- all the diplomats who work in a particular city or country- The reception was given for members of the diplomatic corps.