It’s Donald Trump vs. Ted Cruz in Thursday’s GOP Presidential Debate

The first GOP presidential debate of 2016 is Thursday night, hosted by Fox Business Network at 9pm Eastern. National security will take center stage amid recent terror attacks in Indonesia and Turkey. The candidates are also expected to weigh in on the economy, as volatility in the stock market reaches fever pitch. Keep an eye on Donald Trump and Ted Cruz during the debate. Both candidates are polling neck and neck in Iowa, which holds its caucus in just two weeks. Also, Kentucky Sen. Rand Paul won't be on the main stage debate amid low poll numbers. Reports suggest Paul has also refused to attend the undercard debate. TheStreet's live coverage of the debate begins at 8pm Eastern. Scott Gamm reports from Wall Street.