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Republicans have opposed some of Biden's previous protection measures, alleging he exceeded his legal authority. Some of the president's past actions have included that former President Donald Trump had canceled.

In Pasadena, Southern California, Biden expanded the San Gabriel Mountains ´ºÉ«Ö±²¥ Monument, driven by calls from Indigenous peoples including the Fernandeño Tataviam Band of Mission Indians and the Gabrieleno San Gabriel Band of Mission Indians. Both are the original stewards of the culturally rich and diverse lands, advocates noted in a separate news release.

The president also expanded Berryessa Snow Mountain ´ºÉ«Ö±²¥ Monument in Sacramento in Northern California, to include Molok Luyuk, or Condor Ridge. The ridge has been significant to tribal nations such as the Yocha Dehe Wintun Nation for thousands of years. It is a central site for religious ceremonies and was once important to key trading routes, advocates said.

Expansion of both sites makes nature more accessible for Californians, while protecting a number of species, including black bears, mountain lions and tule elk, the White House release said.

Californians are calling on the Biden administration to make a total of five monument designations this year. The other three include the designation of a new Chuckwalla ´ºÉ«Ö±²¥ Monument, new Kw’tsán ´ºÉ«Ö±²¥ Monument and a call to protect and name Sáttítla, known as the Medicine Lake Highlands, as a national monument.

Against the backdrop of Biden's reelection campaign, the White House emphasized the role of Vice President Kamala Harris in ensuring protections in her home state, including Thursday's.

“These expansions will increase access to nature, boost our outdoor economy, and honor areas of significance to Tribal Nations and Indigenous peoples as we continue to safeguard our public lands for all Americans and for generations to come,� Harris said in a statement.

Expansion and designation efforts are made under the Antiquities Act of 1906, which authorizes the president to “provide general legal protection of cultural and natural resources of historic or scientific interest on Federal lands,� according to the Department of the Interior.

Across the nation, have urged Biden to make a number of other designations over the past three years. , the administration has established or expanded seven national monuments, restored protections for three more and taken other measures, the White House said.

Biden signed a national monument designation called Baaj Nwaavjo I’tah Kukveni last August, a move which the top two Republicans in Arizona's Legislature are .

In 2021, Biden restored two sprawling national monuments in Utah and a marine conservation area in New England where environmental protections had been cut by Trump. The move was also .

, sacred to Native Americans in southern Nevada, was designated in 2023 along with the .

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Alexa St. John is an Associated Press climate solutions reporter. Follow her on X: . Reach her at ast.john@ap.org.