Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE's lead over Donald Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE has narrowed, according to the latest national poll.

Clinton leads the GOP nominee by 4 points, 48 to 44 percent, among registered voters in the NBC News/Survey Monkey tracking poll released Tuesday morning, down 2 points from last week.

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Clinton's lead is even smaller in a four-way matchup. In that scenario, Clinton leads by just 2 points, 42 to 40 percent.

Clinton has seen a tightening of polls recently as she battles criticism over her "basket of deplorables" comment and the delayed release of her pneumonia diagnosis over the weekend.

Her lead in the NBC survey was 10 points about five weeks ago.

Since then, Trump has made up ground among independents who don't lean toward either major party.

Clinton and Trump have similar favorability numbers in the poll, though both are viewed unfavorably by a majority of registered voters.

Thirty-eight percent have a favorable impression of Trump and 39 percent have a favorable impression of Clinton, while 59 percent view Clinton unfavorably and 60 percent view Trump unfavorably.

The survey of 16,220 registered voters was conducted online Sept. 5–11 with an estimated margin of error of 1.1 percentage points.