The Arizona Legislature’s top two Republicans have challenged Democratic President Joe Biden’s creation of a new national monument last summer just outside Grand Canyon National Park, alleging he exceeded his legal authority in making that designation under a century-old law that lets presidents protect sites considered historically or culturally important. In a lawsuit filed Monday against Biden, Arizona Senate President Warren Petersen and House Speaker Ben Toma alleged Biden’s decision to designate the new monument under the 1906 Antiquities Act wasn’t limited to preserving objects of historic or scientific value and isn’t confined to the “the smallest area compatible with the proper care and management of the objects to be protected.” The monument designation will help preserve 1,562 square miles (4,046 square kilometers) just to the north and south of Grand Canyon National Park.