Sen. Kamala Harris, D-Calif., suggested Attorney General William Barr was worried about perjury as the reason for his stammering in response to one of her questions during a Senate Judiciary Committee hearing on Wednesday.

Harris, a 2020 candidate for president and former California attorney general, asked Barr if President Trump or anyone else at the White House suggested to him that he open an investigation into anyone. Barr struggled to answer, saying at one point that he was “trying to grapple with the word ‘suggest.'”