President Donald Trump’s executive order denying U.S. citizenship to the children of parents living in the country illegally has faced the first of what will be many legal tests.

Birthright citizenship was a profound acknowledgment that those born here, regardless of parentage or circumstance, belong here. For over 150 years, this principle has been an unshakable centerpiece of our constitutional framework, accepted across political and ideological divides.

Around three dozen countries and the U.S. offer automatic citizenship to children born within their borders, regardless of their parents immigration status.