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With today's address, he will become the first pontiff to speak to a joint meeting of Congress. The pope is scheduled to arrive in New York City in time for an evening prayer at St. Patrick’s Cathedral.
Wednesday, Pope Francis visited the White House, drawing thousands of cheering fans.
For his full schedule of events and to see an interactive map showing how Pope Francis will be traveling today, click here.
Our live blog, seen below, is going to be run continuously and updated with the latest news and photos from the six-day visit.