“Protecting the Meaning and Value of American Citizenship”—better known as the birthright citizenship executive order —attempts to cancel the 14th Amendment to the US Constitution. Getting rid of constitutional amendments via executive order is new, and, for me at least, “the worst.”

Here’s what to know about Trump’s proposal to add new restrictions in the U.S.—and how that compares to other countries.

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