Thursday night's Republican presidential debate drew 14.5 million viewers, according to initial ratings.
Overnight Nielsen figures showed that 13.2 million watched the debate on CNN and another 1.3 million watched on Spanish-language network Telemundo, according to CNN.
The debate Thursday night in Houston came ahead of Super Tuesday, when GOP voters in 12 states, including Texas, hit the polls. It followed Trump's big win in South Carolina and saw rivals Marco RubioMarco RubioWhat Trump's Cabinet picks reveal House passes water bill with Flint aid, drought relief What the 2016 election can tell us about 2018 midterms MORE and Ted CruzTed CruzCruz, DeSantis to introduce constitutional amendment on term limits Fiorina to meet with Trump on Monday Trump picks Goldman Sachs chief for top economic adviser: report MORE aggressively target the front-runner.
Thursday's debate was the 10th for Republicans this cycle. The first two debates, in August on Fox News and in September on CNN, drew 24 million and 23 million, respectively.
Rubio and Cruz questioned Trump's business record and conservative credentials. Trump in return mocked at Rubio as a "choker" and Cruz as a "basket case."