President Donald Trump talked about sanctuary cities who protect violent criminals instead of handing them to Immigration and Customs Enforcement (ICE) to be safely deported, but the look on Kamala Harris' face is one of disgust for Trump. It seems like she's angry as he speaks out against the sanctuary cities who protect the criminals.
It's one thing to break the law and sneak into America, and many people DO that but do not commit any other crimes. However, it's a really big problem when people sneak into the country, then start hurting others and participating in illegal crimes that are much worse. That's why Trump is calling it out.