This bill would change section 320301 of title 54 (the Antiquities Act). The new text would say: "The establishment or extension of a national monument may be undertaken only by express authorization of Congress." In other words, only Congress could create or expand a national monument under that section.
If the bill becomes law, a President could no longer establish or extend a national monument on their own under section 320301. Instead, Congress would have to pass an express authorization to create or enlarge a national monument.
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The bill text and short title state the goal: to reserve to Congress the authority to establish or extend national monuments. The sponsors introduced it to change section 320301 so that only Congress may authorize monument actions.
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