On substance, I believe President Trump is right on birthright citizenship — the 14th Amendment does not require it. I do not believe, however, that the president may change the interpretation of the 14th Amendment, which has been in effect for decades, by executive order, as he is reportedly contemplating. My friend John Eastman explained why the 14th Amendment does not mandate birthright citizenship in this 2015 New York Times op-ed. In a nutshell, the Amendment states: “All persons born or naturalized in the United States and subject to the jurisdiction thereof, are citizens of the United States and of...