If abortion was supposed to be a state's rights issue, then why is Lindsey Graham proposing a national ban?

Vast Majority Of Americans Don’t Want Abortion Bans, Poll Finds—Even In States Where It’s Already Outlawed (forbes. com)

Fugitive Slave Acts Definition & History Britannica

Only Two Republicans Have Said They Support Lindsey Graham's Abortion Ban (newsweek. com)

For the past month ever since republicans got their victory in the supreme court, they have been paraded themselves as abortion being a states rights issue. However, now that the majority are against them even in states where abortion is illegal, they want to propose a national abortion ban just like when slave holders lost slavery as a states rights issue, they made taking in refugee slaves a crime.

If abortion was supposed to be a state's rights issue, then why is Lindsey Graham proposing a national ban?
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