(BUSINESS INSIDER) — Republican presidential candidates Ben Carson, left, and Donald Trump talk before the start of the CNN Republican presidential debate at the Ronald Reagan Presidential Library and Museum on Wednesday, Sept. 16, 2015, in Simi Valley, Calif.

Retired neurosurgeon Ben Carson has climbed into a virtual tie with real-estate magnate Donald Trump, according to a new poll.

A new NBC/Wall Street Journal poll released Sunday shows Carson with 20% support among Republican primary voters nationally, just 1 point below Trump.

Former Hewlett-Packard CEO Carly Fiorina and Sen. Marco Rubio (R-Florida) tied for third in the poll, both grabbing 11%.

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