Thomas Stewart Udall (/ˈjuːdɔːl/ YOO-dawl; born May 18, 1948) is an American diplomat, lawyer and politician serving as the United States Ambassador to New Zealand and Samoa since 2021. A member of the Democratic Party, he served as a United States senator from New Mexico from 2009 to 2021. Udall also served as the U.S. representative for New Mexico's 3rd congressional district from 1999 to 2009 and New Mexico Attorney General from 1991 to 1999. Born in Tucson, Arizona, he is the son of former U.S. Representative Stewart Udall and the nephew of former U.S. Representative Mo Udall. A member of the Udall family, a western American political family, his relatives include Colorado's Mark Udall and Utah's Mike Lee. He was the dean of New Mexico's congressional delegation. Udall was first electe