Asked whether he would apply a ruling against birthright citizenship by "tak[ing] away citizenship from people who already have it here," Trump first says "I haven't thought of that" but then sure seems to answer yes: "our country cannot afford to house tens of millions of people that came in through birthright citizenship." In defense of the coherence of Trump's yes answer: It sure seems to me that a ruling against birthright citizenship (in context of Trump's EO) would necessarily apply to previously born individuals. *If* the 14th Amendment doesn't confer birthright citizenship, then it has never done so, and there is nothing improperly retroactive about applying it with full force. Whether that's the correct reading of the 14th Amendment is a different question (and not one I have studied with care).