United Nations Issues: Cabinet Rank of the U.S. Permanent Representative [August 12, 2020] [open pdf - 451KB]
From the Document: "The U.S. Permanent Representative is the chief representative of the United States to the United Nations. The President appoints the Permanent Representative with the advice and consent of the Senate. Of the 30 individuals who have served since 1946, approximately two-thirds have been accorded Cabinet rank by Presidents. Some Members of Congress have demonstrated an ongoing interest in the Cabinet rank of the Permanent Representative in the context of the Senate confirmation process and broader U.S. policy toward the United Nations."
CRS In Focus, IF11618
Congressional Research Service: https://crsreports.congress.gov/