The US Pontiff, 69, warmly took hold of Vance's hand as he received a series of world leaders at St Peter's Square.

Pope Leo XIV will be inaugurated as pontiff at a Mass in St Peter's Square. The service will mark the official start of his papacy. Leo was chosen as the new leader of the Catholic Church earlier this month following the death of his predecessor, Pope Francis, and a two-day conclave in Vatican City.

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