“I am grateful to the Vatican for inviting me to talk about an issue that is very dear to my heart, which is how we create a moral economy that works for all of the people rather than just the top one percent,” Sanders said in an interview. “I will also in my remarks be addressing the planetary crisis of climate change and the moral imperative to make sure we leave this planet in a way that is healthy and habitable for future generations.”

Sanders, who would be the nation’s first Jewish president, often refers to Francis on the campaign trail, praising his leadership on economic and environmental issues. Sanders said he believes he will be the only U.S. public official speaking at the gathering.

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Highlights from Bernie Sanders’s campaign, in pictures share Share View Photos View Photos Next Image WASHINGTON, DC- JUNE 14: Presidential candidate, Bernie Sanders arrives at the Capital Hilton to meet with Hillary Clinton on Tuesday June 14, 2016. (Matt McClain/ The Washington Post)

“I think the Vatican has been aware of the fact that, in many respects, the pope’s views and my views are very much related,” Sanders said. “He has talked in an almost unprecedented way about the need to address income and wealth inequality, poverty and to combat the greed that we’re seeing all over this world, which is doing so much harm to so many people. … For me, it is an extraordinary honor to receive this invitation.”

The planned visit has also prompted a dispute among Vatican officials, Bloomberg Politics reported Friday.

Margaret Archer, the president of the Pontifical Academy of Social Sciences, which is hosting the event, said that Sanders didn’t follow proper protocol by failing to contact her office — which she termed a “monumental discourtesy” — and that his presence threatens to make the event political. However, Bishop Marcelo Sanchez Sorondo, the academy’s chancellor, said he had arranged the invitation and that Sanders's presence is welcome.