US Vice President Joe Biden (C) visits the Ottoman-era Sultanahmet mosque in Istanbul

US Vice President Joe Biden (C) visits the Ottoman-era Sultanahmet mosque in Istanbul

US Vice President Joe Biden (2nd L), his wife Jill Biden (2nd R) and his granddaughter Naomi Biden (3rd R) visit the Ottoman-era Sultanahmet mosque in Istanbul

US Vice President Joe Biden (C) visits the Ottoman-era Sultanahmet mosque in Istanbul