From the article:

I“I know what the hell I’m doing,” he declared from the Diplomatic Reception Room at the White House.

He grew emotional recounting a line from the report that suggested he did not recall the year in which his son Beau died.

“There’s even reference that I don’t remember when my son died,” he said. “How in the hell he dare raise that.” Beau Biden died in 2015, when his father was vice president.