This legislation, known as "THE DON-ument Act," proposes the establishment of the Southern Border Wall National Monument across portions of California, Arizona, New Mexico, and Texas. The monument's core purpose is to safeguard the existing southern border wall from any future alteration, designating it as a protected national monument. Comprising approximately 289,920 acres, the monument will include sections of the physical border wall and adjacent lands. The Secretary of the Interior, acting through the Bureau of Land Management, will be responsible for its administration and will establish administrative jurisdiction through memoranda of understanding with relevant federal agencies and Indian Tribes. A general management plan for the monument is required to be prepared within three years of funding and subsequently submitted to Congress.