On 1 December 1990, Tauran was appointed Secretary for Relations with States of the Secretariat of State and Titular Archbishop of Thélepte by Pope John Paul II. He received his episcopal consecration on 6 January 1991 from John Paul II himself, with Archbishops Giovanni Battista Re and Justin Francis Rigali serving as co-consecrators, in St. Peter's Basilica. As Secretary, Tauran essentially served as the foreign minister of the Vatican. In regards to the Iraqi conflict, he once emphasized the importance of dialogue and the United Nations, and said that "a unilateral war of aggression would constitute a crime against peace and against the Geneva Conventions".