President Joe Biden will use his visit to Arizona on Tuesday to formally announce a national monument designation for the greater Grand Canyon, making Native American tribes' and environmentalists' decades-long vision to preserve the land a reality.
Biden is expected to announce plans for a new national monument to preserve about 1,562 square miles (4,046 square kilometers) just outside Grand Canyon National Park, National Climate Advisor Ali Zaidi confirmed a day earlier. It will mark the president's fifth monument designation.
