Vice President JD Vance will lead a U.S. delegation to attend the inaugural Mass on Sunday of Pope Leo XIV, the first U.S. pontiff, who was critical of President Donald Trump and Vance before taking leadership of the global Roman Catholic Church.

Pope Leo XIV has been emphasising his message of peace during the first week of his papacy, preparing to deliver his inaugural mass this Sunday.

Leo XIV held his first Mass as pope in the Sistine Chapel on Friday, in what was a private service for the 132 voting cardinals who elected him as the 267th leader of the world’s 1.4 billion Catholics a day earlier.

Pope Leo XIV, the first American leader of the Catholic Church, previously known as Robert Francis Prevost, returned to the Sistine Chapel the day after his election to deliver a mass for the College of Cardinals, where he described his role as both a cross to bear and a blessing and urged church leaders to make themselves “small.”