Jimmy Fallon March 22, 2018 9:17 am 'Tonight': Jay Leno Tags In to Tell Some Monologue Jokes Former “Tonight Show” host Jay Leno steps in to help Jimmy Fallon tell a few jokes during the monologue. US & World Videos 8:39 Gina Rodriguez gushes 0ver motherhood with son Charlie 2:22 Scarlett Johansson and Colin Jost have date night at White House Correspondents' dinner 2:09 President of MIT calls for shutting down pro-Palestinian encampments 3:57 Pleasant Sunday despite morning showers 1:00 Three dead in apparent murder-suicide in Lowell