It’s to revive the Comstock Act.
Congress hasn’t made a federal law outright banning abortion; but it also hasn’t made a federal law restoring the protections of Roe v Wade. (Biden’s executive orders have shored up women’s access to abortion for now, but a president can’t make federal law. Congress is majority Republican so no chance there.)
So instead of trying for a new federal law, the anti-abortionists have dug up an existing one from 1873 that isn’t primarily about abortion.
The Comstock Act’s meaning has been clarified and narrowed many times since, but anti-abortionists are planning to dust it off and apply the broadest possible meanings – and make it impossible in practical terms for abortion providers to do any work.
If they can get a sympathetic president in the White House (currently pinning their hopes on Trump), they may well be able to do this without Congress.
https://www.bbc.co.uk/news/world-us-canada-68580015