Whitaker seems to be having some memory issues.
"It was revealed Wednesday that former acting Attorney General Matthew Whitaker conveniently forgot many of his conversations with President Donald Trump during a Congressional hearing."
“I do think there is a problem because Whitaker previously didn’t just previously testify in Congress that the president didn’t lash out he also testified in response to a question from Rep. [David] Cicilline was — ‘Did the White House reach out to you in some way to express dissatisfaction?’ Answer: ‘No.’ So Whitaker didn’t have any problem remembering that a month ago, more than a month ago. But now, all of a sudden, he’s got these memory deficits.”
https://www.rawstory.com/2019/03/ex-solicitor-general-calls-bs-matthew-whitaker-forgetting-conversations-trump-sworn-testimony/