Native Americans who maintain their tribal ties and "persons born in the United States who are foreigners, aliens, who belong to the families of ambassadors or foreign ministers". According to historian Glenn W. LaFantasie of Western Kentucky University, "A good number of his fellow senators supported his view of the citizenship clause." Others also agreed that the children of ambassadors and foreign ministers were to be excluded. Senator James Rood Doolittle of Wisconsin asserted that all Native Americans were subject to United States jurisdiction, so that the phrase "Indians not taxed" would be preferable, but Senate Judiciary Committee Chairman Lyman Trumbull and Howard disputed this, arguing that the federal government did not have full jurisdiction over Native American tribes, which govern themselves and make treaties with the United States. In Elk v. Wilkins (1884), the clause's meaning was tested regarding whether birth in the United States automatically extended national citizenship. The Supreme Court held that Native Americans who voluntarily quit their tribes did not automatically gain national citizenship. The issue was resolved with the passage of the Indian Citizenship Act of 1924, which granted full U.S. citizenship to indigenous peoples. Children born to foreign nationals The Fourteenth Amendment provides that children born in the United States and subject to its jurisdiction become American citizens at birth. The principal framer John Armor Bingham said during the 39th United States Congress two years before its passing: At the time of the amendment's passage, President Andrew Johnson and three senators, including Trumbull, the author of the Civil Rights Act, asserted that both the Civil Rights Act and the Fourteenth Amendment would confer citizenship to children born to foreign nationals in the United States. Senator Edgar Cowan of Pennsylvania had a decidedly different opinion. Some scholars dispute whether the Citizenship Clause should apply to the children of unauthorized immigrants today, as "the problem... did not exist at the time". In the 21st century, Congress has occasionally discussed passing a statute or a constitutional amendment to reduce the practice of "birth tourism", in which a foreign national gives birth in the United States to gain the child's citizenship. The clause's meaning with regard to a child of immigrants was tested in United States v. Wong Kim Ark (1898). The Supreme Court held that under the Fourteenth Amendment, a man born within the United States to Chinese citizens who have a permanent domicile and residence in