Lawrence Jones, who made history as the youngest black solo host of a program in cable news, is stepping in to fill ousted Tucker Carlson’s slot on Fox News next week. Jones, 30, who anchors “Lawrence Jones Cross Country” on Fox News on Saturday nights, will host in Carlson’s former 8 p.m. slot from Monday as the network continues with a rotating line-up of anchors. **** Jones, who worked in the Obama campaign when he was 15, reported live from Uvalde, Texas, after the mass shooting that killed 19 children and two adults, and has also covered the death of...