Pope Leo names veteran Vatican diplomat as ambassador to the U.S.

Appointment aims to manage relations with Trump administration amid tensions over Iran, immigration

Published on Mar. 7, 2026

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Pope Leo XIV has named Italian Archbishop Gabriele Caccia, a veteran Vatican diplomat, as the new apostolic nuncio (ambassador) to the United States. Caccia, who currently serves as the Holy See's ambassador to the United Nations, will take over the crucial role from the retiring Cardinal Christophe Pierre. The appointment comes at a time of strained relations between the Vatican and the Trump administration over issues like the war in Iran and the U.S. immigration crackdown.

Why it matters

The relationship between the U.S. and the Holy See is of vital importance, not least because U.S. Catholics are the largest donors to the Vatican's coffers. Caccia's appointment reflects Pope Leo's efforts to navigate these complex ties, as the U.S. church leadership tends to be more conservative while the Pope's priorities align more with his progressive predecessor, Francis.

The details

Archbishop Gabriele Caccia, 68, has served as the Holy See's ambassador to Lebanon and the Philippines before being posted to the U.N. in 2019. He previously held the key administrative role of "assessor" in the Vatican secretariat of state. Caccia will be tasked with managing the Holy See's relationship with the U.S. government and church, which have seen tensions over issues like migration and the U.S.-Israeli war in Iran under the Trump administration.

  • Pope Leo XIV named Caccia as the new apostolic nuncio to the U.S. on March 7, 2026.
  • Caccia will be replacing the retiring Cardinal Christophe Pierre, who has served as the apostolic nuncio in Washington since 2016.

The players

Pope Leo XIV

The current Pope, who is the first U.S.-born pontiff. He has emphasized a message of pacification and unity in the Church.

Archbishop Gabriele Caccia

A 68-year-old veteran Vatican diplomat who is currently the Holy See's ambassador to the United Nations. He will be taking over as the new apostolic nuncio to the United States.

Cardinal Christophe Pierre

The retiring apostolic nuncio to the United States, who has served in that role since 2016.

Archbishop Paul S. Coakley

The current president of the U.S. Conference of Catholic Bishops, who welcomed Caccia's appointment.

Donald Trump

The current President of the United States, whose administration has clashed with the Vatican over issues like migration and the war in Iran.

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What they’re saying

“I receive this mission with both joy and a sense of trepidation.”

— Archbishop Gabriele Caccia (Vatican News)

“We offer Archbishop Caccia our warmest welcome and our prayerful support.”

— Archbishop Paul S. Coakley, President, U.S. Conference of Catholic Bishops (Vatican News)

What’s next

Caccia will begin his new role as apostolic nuncio to the United States in the coming weeks, taking over from the retiring Cardinal Christophe Pierre.

The takeaway

Caccia's appointment reflects Pope Leo's efforts to navigate the complex relationship between the Vatican and the U.S. government and church, which have seen tensions over issues like migration and foreign policy under the Trump administration. As the new ambassador, Caccia will be tasked with managing this crucial bilateral relationship at a time of global turmoil.