"In the Middle East, we have people chopping the heads off Christians," he says.
He hit Obama over ObamaCare, gun rights and "gutting" the military
Cruz is blaming CNN for a rumor that Carson was quitting after Iowa.
For the first time, Trump was not the most talked about candidate during a debate.
Trump accused the Republican National Committee of stacking the crowd with Jeb Bush backers.
He said he didn't want to pursue a bill he knew wouldn't pass.
Trump brushed off Bush, saying he was trying to be a "tough guy."
He said he wants to repeal ObamaCare and have a plan based on "free enterprise."
"He has no idea what he is doing, and the country is going to hell,” said Trump.
Christie mocked Rubio's speaking style; Rubio responded by attacking Christie's character.