MSNBC's Mehdi Hasan: “Great replacement theory” gets people killed and yet you now have Tucker Carlson “defending it, promoting it, mainstreaming it” Written by Media Matters Staff Published 09/28/21 9:19 PM EDT Video file Citation From the September 28, 2021, edition of Peacock's The Mehdi Hasan Show MEHDI HASAN (HOST): “Great replacement theory" gets people killed and yet you now have Tucker Carlson, the most influential right-wing cable news host in America, defending it, promoting it, mainstreaming it. And elected Republicans are now following in his footsteps.