I heard this earlier this week. It has nothing to do with her race, however. But the argument is per the Constitution, as we all have read Im sure, is:
"No person except a natural born Citizen, or a Citizen of the United States, at the time of the Adoption of this Constitution, shall be eligible to the Office of President; neither shall any person be eligible to that Office who shall not have attained to the Age of thirty five Years, and been fourteen Years a Resident within the United States.".
Now, the birther people claim there is a loophole for anchor babies (which Kamala is) that technically doesnt fall under the "natural born citizen" statement. However, the Constitution makes no much mention of this, and SCOTUS has already determined anchor babies ARE in fact natural born citizens, REGARDLESS of the baby's parent's status. Also, the birther people are arguing since she grew up as a teenager in Canada, she's disqualified. Which is bullshit, of course, because she DOES meet the requirement of time lived in the USA.
In other words, the whole thing is bullshit and not even worth the breath to argue about it.