The star Fox News anchor Chris Wallace announced on Sunday that he was leaving for CNN, stripping the Rupert Murdoch-owned network of its most decorated down-the-middle journalist as stridently conservative hosts like Tucker Carlson have increasingly set the channel’s agenda.The network has pulled far ahead of CNN and MSNBC in the ratings with an expanded slate of right-wing commentary that denounces President Biden and defends former President Donald J. Trump. But some members of its newsroom have been unnerved by programming that has given weight to vaccine skeptics or amplified conspiracy theories about the Jan. 6 Capitol riot.Mr. Wallace, 74, had expressed concern to Fox News management about a recent documentary from Mr. Carlson, “Patriot Purge,” which included the false claim that the riot was a “false flag” operation created to demonize the political right. The anchor’s objections, first reported by NPR, were confirmed on Sunday by two people who requested anonymity to share private discussions.Mr. Wallace’s contract as host of “Fox News Sunday” was up at the end of December, and three people familiar wit …
