CNN: More Than 200 Former Diplomats Sound Alarm About Diplomacy Under Trump

"'Our great country faces challenges both today and in the future which require that we have a diplomatic force ready to keep America safe in partnership with the brave men and women of our armed forces,' the authors wrote.

Among the letter's signatories are senior diplomats who've served under Republican and Democratic presidents in posts around the world. The majority were career officials, and all served as either ambassadors, assistant secretaries of state, or under secretaries of state. One of the authors, Amb. Bill Burns, attained the rank of deputy secretary of state during the Obama administration."