Trump is going back to his old playbook.... birtherism sucked in a substantial chunk of idiots so he's reviving the 'question he identity' schtick. That let's them dredge up the Pocohantas slurs and Kenyan/Muslim slurs. It made them feel good before and it'll do it again.

You can be damn sure Trumps and his good christian advisors scoured Harris' record for dirt, so he knew she attended Howard, a black university. But Trump knows he cannot talk about black universities lest he gets bitchslapped with Trump University, He cannot dump on her aggressive prosecutor rep lest he get btchslapped with his felony status. He can't go after her affair with WIllie Brown or he'll get bitchslapped with his string of infidelities. That leaves her racial identity, her laugh, and her name.