The case of United States v. Wong Kim Ark set a legal precedent for all children born in the United States, regardless of their parents' status or citizenship. During the campaigning for the United States presidential election, 2016, the issue of children born in this country to undocumented aliens has come up again. Because of "Wong Kim Ark", a child born in the U.S. is a citizen regardless of his or her parents’ citizenship or status. This could change by means of a Constitutional amendment, but this is a lengthy and difficult process.