Former Texas Democratic congressman Robert Francis "Beto" O'Rourke, said in an interview with MSNBC's Chris Hayes that he would tear down the existing US-Mexico border wall."If you could, would you tear down the wall here now?" Hayes asked O'Rourke. "Yes, absolutely, I would knock down the wall," O'Rourke replied. O'Rourke has not yet announced that he will run in 2020, but everything he has done in recent weeks indicates that he will run.https://twitter.com/RealSaavedra/status/1096222147200995328Beto O'Rourke is not alone in supporting this extremely radical idea, Democratic presidential candidate and...