"Be careful" because Beijing is "making Boeing build this massive plant in China" in order to secure orders, Trump warned.
Should Boeing, which has a major plant in South Carolina, launch operations in the Asian giant as it announced last year that it would, it's "bye-bye to South Carolina," he told an exuberant crowd at a rally in North Augusta.
"It won't happen if I'm president, by the way."
But he and his rivals, including Ted Cruz, Marco Rubio and Jeb Bush, also traded political punches and laid out attack lines ahead of the crucial primary, the first in the US South.
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First-term Senator Rubio, mindful of the large evangelical population in the state, told a townhall in Beaufort yesterday that his faith would help guide his decisions in the Oval Office.
Cruz, another freshman US senator, sought to boost his support among military veterans in South Carolina, taking to the decks of the famed decommissioned World War II battleship USS Yorktown to declare he would restore US military might if elected, after "years of neglect by President Barack Obama.
"Instead, they will be standing on the decks of the mightiest ships the world has ever known with their heads held high, confident that the great country that they volunteered to serve has their back.