Former Donald Trump campaign manager Corey Lewandowski is joining CNN as a political commentator, according to a source familiar with the arrangement. It's a salaried position and will make Lewandowski exclusive to CNN, effective immediately. Trump fired Lewandowski on Monday, ending the tenure of the fiery operative who faced a steady string of controversies while guiding Trump's skeleton campaign operation to a shocking victory in the 2016 Republican presidential primary. That same afternoon, his first in-studio interview was with CNN's Dana Bash (an NBC News reporter caught up with him outside of Lewandowski's apartment as he headed down to the...