Pope names veteran Vatican diplomat as new U.S. ambassador to manage strained relations with Trump administration

The Holy See has appointed a seasoned diplomat to oversee one of its most vital bilateral relationships with the United States—a position previously held by retiring French-born Cardinal Christophe Pierre. Pope Leo XIV, who is also the first U.S.-born pope, has named Italian Archbishop Gabriele Caccia as the new ambassador to the United States.

Caccia, currently serving as the Holy See’s ambassador to the United Nations in New York, steps into a complex and consequential role following his predecessor’s retirement. This transition comes at a time when relations between the U.S. church and state are under scrutiny over issues like immigration crackdowns during the Trump administration and ongoing tensions with Iran.

Caccia’s appointment is particularly significant given the Holy See’s strong connection to U.S. Catholics, who are its largest donors. Archbishop Caccia has previously served in positions of considerable influence within the Vatican Secretariat of State, as well as brief stints in Lebanon and the Philippines before his current assignment at the United Nations.

Caccia’s tenure will carry with it a challenging portfolio that includes ongoing conflicts between progressive Catholic bishops and the more traditional stance of Pope Francis. A notable example of this dynamic was Pierre’s time as ambassador, marked by significant frictions over migration policies and U.S. church-state relations.

Over the past administration, tensions have continued under Leo’s leadership. The Holy See has repeatedly advocated for diplomatic resolution in conflicts involving both Iran and Israel, emphasizing human dignity and pacifism. In his recent foreign policy speech, Pope Leo emphasized a message of unity and opposition to unilateral military actions that threaten global peace and international legal frameworks.

Caccia succeeds Pierre, who was replaced at age 80 due to health considerations but whose time in office saw clear signs of disagreement between Catholic bishops and the papacy. These disagreements have sometimes manifested through issues like immigration policies and the Holy See’s dealings with Iran. Leo has sought dialogue, urging all parties involved—including Washington and Tel Aviv—to de-escalate their confrontations.

The U.S. Conference of Catholic Bishops, led by Archbishop Paul S. Coakley, expressed warm support for Caccia’s appointment, underscoring the importance of maintaining a diplomatic posture with the Holy See in these delicate times.