Newsweek Vocabulary

interlocutors

From the sentence you can see that it must be someone important since whats its between. inter means like to be apart of so its a part of commuating with foreigners.

Fearless and righteous, McCain has long been known to unleash a lacerating anger on those who cross him- Senate colleagues, foreign interlocutors, even the interrogators who once held his life in their hands at the Hanoi Hilton.