Yes they can. The President can nominate and the legislative can appoint, Supreme Court justices who will overturn that decision. Lacking that, a constitutional amendment can be implemented, but that would require approval of the state legislatures as well (the President has no say so in a constitutional amendment by the way). That is the nature of the system of "checks and balances" set up by the founding fathers.
So why doesn't the President push for a constitutional ammendment banning abortion?