According to the search results, Chris Hayes, the host of "All In with Chris Hayes" on MSNBC, was not hosting his show during the week of September 25, 2023, but he had not announced any plans to leave the network. He was likely taking a vacation and spending time with his family and working on other projects. Chris Hayes has not worked on Mondays for the last year, and his show has had a rotating slate of guest hosts on Monday nights as he has worked on his podcast, an upcoming book, and live events. Although Jen Psakis new show, "Inside with Jen Psaki," will begin airing on Mondays at 8/7c, "All In With Chris Hayes" will continue to hold that time slot Tuesdays through Fridays. Therefore, it seems that Chris Hayes is still hosting his show on MSNBC, and there is no indication that he plans to leave the network.