There's at least some extremely lame and weak arguments that Romney, McCain and Ted Cruz weren't eligible.A VERY minority view of a fringe - not part of mainstream legal thought.
But for Harris, there isn't even a fringe/minorit view. It is complete made up racist bull shirt.
No law degree required to understand what the 14th Amendment says:
Section 1. All persons born or naturalized in the United States, and subject to the jurisdiction thereof, are citizens of the United States and of the State wherein they reside.
And also United States v. Wong Kim Ark, 169 U.S. 649 (1898): birthright citizenship applies to children of foreigners present on American soil.
JFC. SMH.