NEW YORK — NBC “Tonight” show host Jimmy Fallon has apologized for doing an impersonation of comic Chris Rock while in blackface during a 2000 episode of “Saturday Night Live.”

Discussion of Fallon’s 20-year-old skit surfaced this week after a video of it was posted on Twitter and showed Fallon, as Rock, appearing on a talk show.

Fallon tweeted Tuesday it was a terrible decision to impersonate Rock, also a former “Saturday Night Live” cast member.

“I am very sorry for making this unquestionably offensive decision and thank all of you for holding me accountable,” he wrote.

The Twitter user who posted the clip mentioned Megyn Kelly, who was taken off the “Today” show and eventually left NBC News after suggesting in 2018 that it was OK for children to wear blackface in Halloween costumes. She apologized for her remark.