Pope Francis has arrived in New York, where he will speak at the United Nations General Assembly. On Thursday he became the first pope ever to address a joint session of Congress. He urged nations to adopt the Golden Rule when it came to dealing with refugees, and used the opportunity to call for an end to the international arms trade. “Why are deadly weapons being sold to those who plan to inflict untold suffering on individuals and society?” Pope Francis asked. “Sadly, the answer, as we all know, is simply for money—money that is drenched in blood, often innocent blood. In the face of this shameful and culpable silence, it is our duty to confront the problem and to stop the arms trade.” After the congressional address, Pope Francis skipped an offer to dine with lawmakers in order to eat with homeless residents of Washington, D.C. “We can find no social or moral justification, no justification whatsoever, for lack of housing,” Pope Francis said. We speak to Sister Simone Campbell, executive director of NETWORK and leader of the Nuns on the Bus project.