Pope Francis, center arrives to concelebrate a mass in the Chaldean Cathedral of Saint Joseph, in Baghdad, Iraq, Saturday, March 6, 2021. Earlier today Francis met privately with the country's revered Shiite leader, Grand Ayatollah Ali al-Sistani. (AP Photo/Andrew Medichini)

Faithful wait outside the Chaldean Cathedral of Saint Joseph where Pope Francis is expected to concelebrate mass in, in Baghdad, Iraq, Saturday, March 6, 2021. Earlier today Francis met privately with the country's revered Shiite leader, Grand Ayatollah Ali al-Sistani. (AP Photo/Andrew Medichini)

Pope Francis , right, arrives at an interreligious meeting near the archaeological area of the Sumerian city-state of Ur, 20 kilometers south-west of Nasiriyah, Iraq, Saturday, March 6, 2021. Ur is considered the traditional birthplace of Abraham, the prophet common to Muslims, Christians and Jews. Earlier today Francis met privately with the country's revered Shiite leader, Grand Ayatollah Ali al-Sistani. (AP Photo/Andrew Medichini)

An aerial photo shows the 6,000-year-old archaeological site of Ur amid preparations for Pope Francis' visit near Nasiriyah, Iraq, Saturday, March 6, 2021. Pope Francis arrived in Iraq on Friday to urge the country's dwindling number of Christians to stay put and help rebuild the country after years of war and persecution, brushing aside the coronavirus pandemic and security concerns to make his first-ever papal visit. (AP Photo/Nabil al-Jourani)

Pope Francis, center, listens during an interreligious meeting near the archaeological site of Ur near Nasiriyah, Iraq, Saturday, March 6, 2021. Pope Francis and Iraq's top Shiite cleric delivered a powerful message of peaceful coexistence Saturday, urging Muslims in the war-weary Arab nation to embrace Iraq’s long-beleaguered Christian minority during an historic meeting in the holy city of Najaf. (AP Photo/Nabil al-Jourani)

An aerial photo shows archeological site of the 6,000-year-old archaeological site of Ur during the preparations for Pope Francis' visit near Nasiriyah, Iraq, Saturday, March 6, 2021. Pope Francis arrived in Iraq on Friday to urge the country's dwindling number of Christians to stay put and help rebuild the country after years of war and persecution, brushing aside the coronavirus pandemic and security concerns to make his first-ever papal visit. (AP Photo/Nabil al-Jourani)

An aerial photo shows participants into an interreligious meeting with Pope Francis' visit what is believed to be Abraham's house in the archaeological area of the Sumerian city-state of Ur, 20 kilometers southwest of Nasiriyah, Iraq, Saturday, March 6, 2021. Pope Francis arrived in Iraq on Friday to urge the country's dwindling number of Christians to stay put and help rebuild the country after years of war and persecution, brushing aside the coronavirus pandemic and security concerns to make his first-ever papal visit. (AP Photo/Nabil al-Jourani)

Pope Francis attends an interreligious meeting near the archaeological area of the Sumerian city-state of Ur, 20 kilometers south-west of Nasiriyah, Iraq, Saturday, March 6, 2021. Ur is considered the traditional birthplace of Abraham, the prophet common to Muslims, Christians and Jews. Earlier today Francis met privately with the country's revered Shiite leader, Grand Ayatollah Ali al-Sistani. (AP Photo/Andrew Medichini)

Pope Francis delivers his speech during an interreligious meeting near the archaeological area of the Sumerian city-state of Ur, 20 kilometers south-west of Nasiriyah, Iraq, Saturday, March 6, 2021. Ur is considered the traditional birthplace of Abraham, the prophet common to Muslims, Christians and Jews. Earlier today Francis met privately with the country's revered Shiite leader, Grand Ayatollah Ali al-Sistani. (AP Photo/Andrew Medichini)

Pope Francis, left, listens during an interreligious meeting near the archaeological site of Ur near Nasiriyah, Iraq, Saturday, March 6, 2021. Pope Francis and Iraq's top Shiite cleric delivered a powerful message of peaceful coexistence Saturday, urging Muslims in the war-weary Arab nation to embrace Iraq’s long-beleaguered Christian minority during an historic meeting in the holy city of Najaf. (AP Photo/Nabil al-Jourani)