Joseph R. Biden Jr.’s presidential campaign contacted top television anchors and networks on Sunday to “demand” that Rudolph W. Giuliani, President Trump’s personal lawyer, be kept off the air because of what they called his misleading comments about the Biden family and Ukraine. “We are writing today with grave concern that you continue to book Rudy Giuliani on your air to spread false, debunked conspiracy theories on behalf of Donald Trump,” a pair of top Biden campaign advisers, Anita Dunn and Kate Bedingfield, wrote in the letter. “Giving Rudy Giuliani valuable time on your air to push these lies in...