Democratic presidential front-runner Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE’s lead over likely general election rival Donald Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE has narrowed to just 3 points in a new poll.

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Clinton leads the presumptive Republican presidential nominee 46 to 43 percent in the NBC News/Wall Street Journal poll released early Sunday, within the survey's margin of error.

In a similar poll in April, Clinton held an 11-point lead over the businessman, 50 to 39 percent.

Democratic presidential hopeful Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE, however, would beat Trump by 15 points in a hypothetical match-up, 54 to 39 percent, according to the new poll.

Trump and Clinton are both burdened with high unfavorable ratings in the latest poll. Fifty-eight percent view Trump unfavorably, while 54 percent have a negative opinion of Clinton.

Pollsters also found that almost half of voters, 47 percent, would consider a third-party candidate if Clinton and Trump face off as the major parties’ nominees in the fall.

— This report was updated at 9:17 a.m.