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WASHINGTON, USA - SEPTEMBER 24: US Vice President Joe Biden (L-2) and House SpeakerJohn Boehner (R) wait for Pope Francis (not pictured) to speak at a joint session of the United States Congress at the U.S. Capitol building in Washington, USA on September 24, 2015. (Photo by Samuel Corum/Anadolu Agency/Getty Images)

WASHINGTON, USA - SEPTEMBER 24: US Vice President Joe Biden (L-2) and House SpeakerJohn Boehner (R) wait for Pope Francis (not pictured) to speak at a joint session of the United States Congress at the U.S. Capitol building in Washington, USA on September 24, 2015. (Photo by Samuel Corum/Anadolu Agency/Getty Images)