Pope Leo XIV named a veteran Vatican diplomat as his new ambassador to the United States. Archbishop Gabriele Caccia is tasked with managing one of the Holy See’s most important bilateral relationships, which has come under strain over the Trump administration’s war in Iran and immigration crackdown. Caccia is currently the Holy See’s ambassador to the United Nations in New York. He replaces Cardinal Christophe Pierre, who at age 80 is retiring as apostolic nuncio in Washington.