> Second, as I see it, some of the other abortion-related legal questions raised by today’s decision are not especially difficult as a constitutional matter. For example, may a State bar a resident of that State from traveling to another State to obtain an abortion? In my view, the answer is no based on the constitutional right to interstate travel. May a State retroactively impose liability or punishment for an abortion that occurred before today’s decision takes effect? In my view, the answer is no based on the Due Process Clause or the Ex Post Facto Clause.