Although there is no Supreme Court decision on the issue of birthright citizenship for children of illegal aliens, it is referred to in the dicta in a few cases. The most important is Plyler v. Doe, a 1982 five-to-four decision, in which the Court reached the remarkable conclusion that Texas is constitutionally required to grant free public education to the children of illegal aliens. The opinion of the Court was by Justice William J. Brennan Jr., perhaps the most liberal-activist Justice in the history of the Court and the source of most of the Court’s remarkable innovations in the last half of the twentieth century. The decision, like the grant of birthright citizenship to children of illegal aliens, makes a mockery of our immigration laws, but Justice Brennan never let law, fact, or logic stand in the way of a decision he wanted to reach. He agreed with President Barack Obama that the function of the court was to decide challenging cases on the basis of “empathy.”
(Lino A. Graglia, "Birthright Citizenship for Children of Illegal Aliens: An Irrational Public Policy," Texas Review of Law & Politics 14 [fall 2009]: 1-14, at 11 [footnotes omitted])

