(CNN) After President Donald Trump called her "nasty," Sen. Kamala Harris on Thursday asserted that her "primary interest is to pursue justice" in keeping with what the American people want.

Trump's comments came following the California Democrat's rigorous questioning of Attorney General Bill Barr on Wednesday, which prompted Barr to reveal key details surrounding the handling of the Mueller report during his contentious testimony before the Senate Judiciary Committee.

On Fox Business Wednesday, Trump said Barr "performed incredibly well," before host Trish Regan reminded him of Harris' role.

"She was probably very nasty," he replied.

When asked by CNN's Alisyn Camerota on "New Day" Thursday what Trump's name-calling was about, the 2020 presidential Democratic candidate responded, "God only knows."

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