The biggest disagreement among the candidates: whether they should go after one another or train their fire on Hillary Clinton.
The four candidates dueled over policy differences on immigration, foreign policy and Donald Trump.
Low-polling GOP candidates that included South Carolina Senator Lindsey Graham and Louisiana Governor Bobby Jindal sparred over everything from foreign policy to immigration.
The 80-minute debate featured seven Republican candidates whose polling numbers were too low to qualify for the prime-time event on Fox News.
The second-tier Republican presidential candidates had trouble editing down their Hillary critiques.
Jena Meaux and Ali Martin were watching a showing of "Trainwreck" when a gunman opened fire inside the movie theater.
Louisiana's governor enters the race for the Republican nomination.