H.R.2258: To amend section 320301 of title 54, United States Code, to modify the authority of the President of the United States to declare national monuments, and for other purposes.

This bill declares that any proclamation of a national monument or reservation of a parcel of land as part of a national monument shall expire three years after the proclamation or reservation unless specifically approved by: (1) a federal law enacted after the date of the proclamation or reservation; and (2) a state law, for each state where the land involved is located, that is enacted after such date.

(Source: Library of Congress)