Members of the U.S. Conference of Catholic Bishops (USCCB) will walk along the Arizona-Mexico border and hold a Mass Tuesday which will be streamed live to remember the migrants who have died and to pray for immigration reform. The group of bishops will be joined by Cardinal Sean O'Malley, who is a key adviser to Pope Francis.

"“What we fail to remember in this debate is the human aspect of immigration - that immigration is primarily about human beings, not economic or social issues,” said Bishop Eusebio Elizondo, auxiliary bishop of Seattle and chairman of the USCCB Committee on Migration, in a statement. "Those who have died, and those deported each day, have the same value and innate God-given dignity as all persons, yet we ignore their suffering and their deaths."

The USCCB, as well as U.S. evangelical groups, are actively pressuring Congress to move on immigration reform; House Republicans have stalled on putting legislation forward, though a bipartisan bill was passed in the Senate last June. On their site, the Catholic bishops urge "fasting in solidarity," as well as sending "electronic cards" to members of Congress advocating for reform.