President Joe Biden is expected to designate the area around the Grand Canyon as the nation’s newest national monument to safeguard it from uranium mining, according to multiple reports.

The president will visit Arizona on Monday. The administration previously announced he would talk about his administration’s response to climate change as the region endures soaring temperatures, as well as the Inflation Reduction Act and his push toward more clean energy manufacturing.

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“No decisions have been made,” White House spokesman Abdullah Hasan said in an email to the Washington Post. “But I can tell you that President Biden has conserved more land and water in his first year than any president since JFK, and his climate protection record is unmatched.”

For years, leaders of local tribes and environmentalists have been advocating to protect areas near the park from uranium mining, which they argue would threaten aquifers and water supplies. They have requested the administration to double the protected area around the canyon by including the 1.1 million acres of public lands in a Baaj Nwaavjo I’tah Kukveni Grand Canyon National Monument.

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Uranium mining advocates have voiced opposition to the proposal, arguing that the country needs to reduce its reliance on Russia for uranium, which fuels nuclear reactors that provide about half of the nation’s carbon-free electricity. Some ranchers in southern Utah have also raised concerns about the designation, reasoning that the proposed national monument would eliminate their ability to allow cattle to graze on the public lands during the winter months.

Interior Secretary Deb Haaland visited the land near the Grand Canyon in May to highlight the local conservation efforts, signaling the administration was considering the move.