Donald Trump's taunting the party, saying he'll consider running as an independent if he's not treated well while Ben Carson is warning that if the party elites choose the nominee at a brokered convention, he's out, too. Democratic strategist Steve McMahon and Republican pollster Kellyanne Conway discuss.Dec. 12, 2015
UP NEXT
Rep. Doug Collins gives Republicans' opening statement in impeachment markup
10:54
Barbara McQuade: Republicans destroy credibility when they deny obvious facts
01:45
Republicans – including Pierre Delecto – struggle to defend Trump
06:47
Even Trump thinks impeachment is inevitable
16:42
Matthews: Will Congress do ‘its duty under the Constitution?’