Harris had an embarrassing moment during an interview with Fox News. Fox News is a conservative media outlet, and the host who interviewed Harris, although usually supporting the Republican Party, is relatively Democratic in political stance.
During the interview, the host asked Harris some basic questions, but Harris's answers were not satisfactory. For example, when asked what she had done in the past three and a half years, Harris's answer seemed a bit long-winded and off-topic, and finally said that Trump was running the country, which was obviously not true.
In addition, the host asked Harris if she knew that border managers generally supported Trump and when she began to realize the seriousness of the border problem. These questions seem to reveal that Harris's position on some key issues may not be clear, or there are deficiencies in public communication. This interview was obviously a public relations mistake for Harris.