But what really irks the tight-borders bunch, and has for years, is that birth tourism — maternity tourism, whatever you want to call it — is perfectly, Constitutionally protected, 100 percent legal. The whole idea of birthright citizenship is different here than in many other countries, where citizenship is based on lineage. Donald Trump made changing the 14th Amendment, or somehow addressing birthright citizenship through legislative means, a platform of his immigrant-targeted campaign. And so it is that birth tourism thrives. Scaring away non-native parents-to-be, as Law suggests, is one way that could deter birth tourism.