Joe Biden’s presidential campaign made an extraordinary request to executives of top news channels on Sunday, asking them to no longer book Donald Trump’s personal lawyer, Rudy Giuliani, on their programs. In a letter addressed to the heads of the major news and cable networks, as well as top news anchors, two top Biden campaign advisers make the case that by peddling routine falsehoods about the work of Biden and his son Hunter in Ukraine, Giuliani’s presence on the airwaves is editorially untenable. “We are writing today with grave concern that you continue to book Rudy Giuliani on your air...