Birthright citizenship is the principle that every baby born in the United States is a U.S. citizen. The Constitution’s 14th Amendment guarantees the citizenship of all children born in the United States (with the extremely narrow exception of children of foreign diplomats) regardless of race, color, or ancestry.

https://www.aclu.org/press-releases/immigrants-rights-advocates-sue-trump-administration-over-birthright-citizenship-executive-order