A white man punched and attempted to choke a black protester who was thrown on the ground at a Donald Trump rally in Birmingham on Saturday morning, as an onlooker yelled, "Don't choke him! Don't choke him!" The protester, identified by local media as well-known activist Mercutio Southall Jr., started shouting during Trump's speech and could be heard yelling, "Black lives matter!" A fight broke out around him, prompting Trump to briefly halt the rally and demand removal of Southall. "Get him the hell out of here, will you please?" Trump said. The crowd alternated between cheering and booing as...