"There are very few people with greater experience over a longer period of time, " said Nicholas Burns, a former career ambassador who has served every secretary of state since Warren Christopher, and was most recently undersecretary for political affairs under Condoleezza Rice.
"There are very few people with greater experience over a longer period of time, " said Nicholas Burns, a former career ambassador who has served every secretary of state since Warren Christopher, and was most recently undersecretary for political affairs under Condolleezza Rice.