Another poll and another huge lead for Republican Donald Trump in the crowded GOP race for the White House.

DUBUQUE, IA - AUGUST 25: Donald Trump at a campaign event at the Grand River Center on August 25, 2015 in Dubuque, Iowa. (Photo by Scott Olson/Getty Images)

A new Monmouth University poll released Tuesday shows Trump has surged to 30 points among likely voters in the South Carolina primary. That's double his closest rival, which in that state is Dr. Ben Carson. After that, everyone polls less than 10 percent, including Jeb Bush at 9 percent.

Carly Fiorina has increased to 6 percent.

Gov. Chris Christie continues to see his poll numbers fall, now polling at just 2 percent. Only Rich Santorum does worse, with 1 percent.

Trump also leads the pack in recent surveys in New Hampshire and Iowa.