Don Lemon was off the air for a second consecutive show on Monday as the CNN morning host grapples with criticism over his comment that 51-year-old Republican presidential candidate Nikki Haley is “past her prime.”

Mr. Lemon, 56, had “the day off,” co-host Poppy Harlow told viewers Monday. He wasn’t on the air Friday either, when he said he had a scheduled day off.

A CNN spokesperson didn’t immediately comment on whether Mr. Lemon will return to work Tu …