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Bernie Sanders outperforms Hillary Clinton in a hypothetical general-election matchup against Donald Trump, according to the results from the new NBC New/Wall Street Journal poll.

Sanders leads Trump by 15 points nationally over Trump, 54 percent to 39 percent, while Clinton’s advantage over Trump is 10 points, 51 percent to 41 percent.

Related: Poll: Clinton Holds 25-Point National Lead Over Sanders

Electability has become a flashpoint in the Democratic presidential race between Clinton and Sanders ahead of Sunday night’s debate in Charleston, S.C. The debate airs on NBC at 9:00 pm ET.

Related: How to Watch the NBC News-YouTube Democratic Debate

The NBC/WSJ poll was conducted Jan. 9-13 of 800 registered voters, which has a margin of error of plus-minus 3.5 percentage points.