President Donald Trump addresses a joint session of Congress.

The special looks at the legacy of Pope Francis, the leader of the Roman Catholic Church who was elected in 2013 as the first ever pope from Latin America, and documents his life from childhood to a young priest, through his papacy, and both the issues he challenged and those which challenged him, including the longstanding cover-up of abuse in the Catholic Church. It examines a pope known for his humility and considered to be a modern and accessible leader who reached out to people of disparate faiths and backgrounds, opening the Church to the way people live today. The special also spotlights how he questioned ideas, looking for places where he felt he was particularly needed, from immigration to women in the church to the treatment of the gay community and climate change.