On the final Friday of her vice-presidency, Kamala Harris partook in one last ritual. She looked disbelievingly as she walked into her ceremonial office in the Eisenhower Executive Office Building, across the street from the White House,

Harris, born in Oakland, California, in 1964, is a natural-born U.S. citizen under the 14th Amendment, which grants citizenship to anyone born on U.S. soil.

Immigration — an issue that Trump campaigned heavily on — will be one of the first legal battles the administration faces.