REUTERS/Jonathan Ernst
Trump was declared the winner by ABC News, NBC News, Fox News, and The Associated Press shortly after South Carolina poll sites closed at 7 p.m. EST.
Most polls had given Trump a big edge heading into the primary. He held a 13-point lead over Sens. Marco Rubio and Ted Cruz, per the RealClearPolitics average of recent polls there.
The South Carolina victory followed an easy win for Trump in New Hampshire and a second-place showing in Iowa. The Republican caucuses in Nevada will weigh in on the GOP primary on Tuesday.
More to come...