the Chief Diplomat
noun /ðə ˌtʃiːf ˈdɪpləmæt/
/ðə ˌtʃiːf ˈdɪpləmæt/
[usually singular] (North American English)- the president of the United States, as the person who directs and manages how the country deals with foreign governments
- As the POTUS is the Chief Diplomat, he or she can sign anything.