The president and the pope "will continue the dialogue, which they began during the President's visit to the Vatican in March 2014, on their shared values and commitments."
"I ask you all, please do not miss making your prayer," Pope Francis said. "This prayer for the synod on the family is for the good of all."
A traditionalist bishop who has denied the Holocaust has been automatically excommunicated along with the priest he illicitly ordained a bishop.
British Bishop Richard Williamson violated church law when he ordained Fr. Jean-Michel Faure, 73, a bishop without papal approval during a ceremony in Nova Friburgo, Brazil, on Thursday, the feast of St. Joseph.
While the Vatican did not comment immediately, canon law provides automatic excommunication for the newly ordained bishop and for the bishop ordaining him in cases where the ordination goes against the will of the pope.
Pope Francis will dine with about 90 prisoners who won their spots after a raffle among some 1,900 detainees.
Cardinal Luis Antonio Tagle of Manila, Philippines, has been named the new president of the Catholic Biblical Federation.
While Tagle was elected unanimously as head of the federation at an Oct. 24-25 meeting in Rome of its executive committee, Pope Francis confirmed his election March 5.
He will assume his office at the federation's plenary assembly, to take place June 18-23 in Nemi, Italy. Tagle will succeed Italian Archbishop Vincenzo Paglia, who has been president of the Catholic Biblical Federation since 2002.
"It's like a little vague feeling. But I have the feeling that the Lord puts me [here] for a brief thing and not more."
"Respect for the dignity of every human person and the common good are the two pillars on which the position of the Holy See has developed."
Over the centuries, the international community has developed criteria for determining whether a war is just and for regulating conduct in combat; now it needs clearer guidelines for "humanitarian intervention" and for post-conflict reconciliation, said the Vatican secretary of state.
Cardinal Pietro Parolin, Pope Francis' top aide and chief coordinator of the Vatican diplomatic corps, also warned against indifference toward situations of conflict around the world.
Shot dead while celebrating Mass in 1980, Romero has long been considered a saint by many in Latin America, but the official Vatican process of sainthood lingered.
Bishop Fridolin Ambongo Besungu said the changes to the Vatican seem "like a change not only in attitude here, but a new anthropology for the way of living our faith."