covered for Jenna Bush Hager on the “Today” show Monday in a possible tryout for Hoda Kotb’s gig.Jarrett, 40, joined Kotb for the fourth hour of the NBC program as Bush Hager stayed home.“Jenna is a little under the weather. All of her kids got sick,” Kotb, 60, explained at the top of the episode. “You cannot escape the germs.