Tonight Show With Jimmy Fallon December 13, 2019 4:44 am ‘Tonight': Trump Goes After Greta Thunberg In his monologue, Jimmy Fallon jokes about President Donald Trump going after 16-year-old climate activist Greta Thunberg, SantaCon and the latest impeachment hearings. US & World Videos 6:22 Craig Melvin compares ‘TODAY' crew to NASCAR 1:19 Met Gala 2024 after party looks: Cardi B, Lana Del Rey, EmRata 1:02 Judge indefinitely delays Trump's classified documents criminal trial 9:25 Zayn Malik opens up about 6-year journey to new album 5:28 Biden condemns antisemitism as attack on democracy during Holocaust remembrance speech