The Vatican said it hoped for 'serene collaboration' with the US on a number of issues

President Trump and his wife step off Air Force One at Rome’s Fiumicino Airport (Getty images)

President Trump is welcomed by the prefect of the papal household Archbishop Georg Gaenswein (Getty images)

(Getty images)

President Trump shakes hands with Pope Francis (Getty images)

Pope Francis speaks with President Trump at a private audience (Getty images)

Donald Trump sits at the Pope’s desk (CNS photo)

First Lady Melania Trump dresses in black and wears a mantilla, as is traditional (CNS photo)

Pope Francis exchanges gifts with US President Donald Trump and First Lady Melania Trump (Getty images)

Pope Francis poses with US President Donald Trump, US First Lady Melania Trump and Ivanka Trump at the end of a private audience (Getty images)

(Getty images)

(Getty images)