The organization said the current edition of the U.S. norms "needs more than minimal editing."

The end of Temporary Protected Status and the Deferred Action for Childhood Arrivals programs means more than 215,000 Salvadorans are now facing a return to a country in turmoil.

The pope has written an introduction to the new book "Potere e Denaro" ("Power and Money").

The gathering at Georgetown University, "Though Many, One: Overcoming Polarization Through Catholic Social Thought," is meant to be a starting point to bring about Pope Francis' vision of the church.

Pope Francis' letter asked "forgiveness of all those I have offended" and said he hoped to "be able to do it personally in the coming weeks."

El Salvador's bishops asked the pope that the canonization be held in their country so that the poor could attend.