John Stossel, the longtime ABC News correspondent and co-anchor of “20/20,” is leaving ABC to join Fox News Channel and Fox Business Network. TVNewser has learned Stossel will host a weekly, one-hour program for the 2-year-old business channel. He’s expected to signed a multi-year deal with Fox which will include regular appearances on Fox News Channel during daytime and primetime. He’ll also host four, hour-long specials on Fox News, much like the business/consumer specials he’d hosted for years on ABC.