I believe he is trying to lay the gorund work ... and pointing out the hypocrisy that goes on with murder.
Abortion is murder of the unborn. You can’t get away with murdering an adult and have THAT vary by state. You don’t want abortion, which is murder, legal in one state and illegal in another for the same reasons.
I agree, but the first step has to be to win the battle over whether or not the Supreme court gets to make policy decisions that have the effect of law.
Trying to overide the flawed reasoning in Roe v. Wade with a constitutional amendment is tilting at windmills I’m afraid.