A "bon vivant", Temple received his highest public appointment as Secretary to the American delegation at the Treaty of Paris in 1782 – 1783, largely through the influence of his grandfather. He never again attained a significant political post in the United States. Benjamin Franklin unsuccessfully lobbied Congress in the hope that Temple would be given a diplomatic post; he believed that, in time, his grandson would succeed him as Ambassador to France. His appeal was rejected for a variety of reasons, including political opposition to Benjamin Franklin and suspicions about Temple's relations with his Loyalist father, who by then was in exile in London. Thomas Jefferson commiserated with Temple over his failure to secure a post, but wrote a letter to James Monroe raising questions about the young man's temperament and abilities.