Poll: Donald Trump chips away at Hillary Clinton's national lead

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Must Read: How healthy are Clinton and Trump?

Hillary Clinton's national lead over Donald Trump has narrowed slightly to 6 points, according to the latest NBC News|SurveyMonkey Weekly Election Tracking Poll.

Clinton now enjoys 48 percent support, while Trump holds steady with 42 percent. Last week, Clinton led Trump by 8 points. The latest NBC News|SurveyMonkey poll was conducted online from August 22 through August 28 among registered voters.

In a four-way general election match-up, Clinton leads with 41 percent, a 4-point margin over Trump (37 percent). Libertarian Gary Johnson maintains 11 percent of the vote and Green Party candidate Jill Stein holds steady with 5 percent.

Given the highly partisan nature of voting, it's clear there are not that many voters who are persuadable. Since both parties' conventions last month, a roughly equal number of Republicans and Republican-leaners support Trump and an equal number of self-identified Democrats and Democratic-leaners support Clinton.

The one group that is open to changing their minds are registered Independents who do not lean toward either party. Trump has made inroads with this group. Two weeks ago, Clinton led Trump by 12 points among this key group of persuadable voters — 40 percent to 32 percent. This week, that lead is down to just 4 points — 37 percent to 33 percent.

The presidential campaign will enter a final phase after Labor Day, when there will be an increase in political advertising in battleground states and final appeals will be made to those few voters who have yet to make up their minds.

RELATED: RCP general election poll average - Clinton vs. Trump

Though the tracking poll shows that Trump may be closing the gap against Clinton among Independent voters, another key question for both campaigns is whether these non-partisans will be motivated to vote at all. According to data from this week's tracking poll, 70 percent of Independents who now support Clinton say they have supported someone else in the past six months. Among those Independents who currently support Trump, 64 percent say they supported someone else in the past six months.

RELATED: Important people who support Hillary Clinton

12 PHOTOS
Important people who support Hillary Clinton (Politicians, famous figures, other celebs)
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Important people who support Hillary Clinton (Politicians, famous figures, other celebs)

Warren Buffett, chairman and chief executive officer of Berkshire Hathaway Inc., smiles during an event with Hillary Clinton, former Secretary of State and 2016 Democratic presidential candidate, in Omaha, Nebraska, U.S., on Wednesday, Dec. 16, 2015. Buffet said at the rally that he was supporting Clinton's bid for president because they share a commitment to help the less affluent. (Photographer: Daniel Acker/Bloomberg via Getty Images)

Governor Jerry Brown, seen here with then-candidate Bill Clinton in 1992, notoriously did not like the Clintons for years, but announced a week before the California primary that he would back Hillary Clinton. (Photo by Cynthia Johnson/Getty)
Actor Leonardo DiCaprio, seen here at the 2016 Vanity Fair Oscar Party, hasn't formally endorsed Hillary Clinton but he has donated $2700 to her campaign and backed her in 2008. (Photo by Axelle/Bauer-Griffin/FilmMagic)
Walter Mondale was the first former Democratic vice president to endorse Clinton (REUTERS/Craig Lassig)
Rep. John Lewis, D-Ga., has been an early Clinton backer, seen here at a 'Super Tuesday' watch party her campaign in Atlanta, Ga., March 1, 2016. He is famous for his work fighting for civil rights alongside Dr. Martin Luther King Jr. (Photo By Tom Williams/CQ Roll Call)
LEBANON, NH - JANUARY 09: Former U.S. Women's National Soccer Team captain Abby Wambach smiles while she is introduced to a crowd at a Hillary Clinton campaign office on January 9, 2016 in Lebanon, New Hampshire. Wambach highlighted Democratic presidential candidate Hillary Clinton's commitment to standing up for women and girls. (Photo by Scott Eisen/Getty Images)
Singer Demi Lovato, seen here onstage at WE Day California 2016, is a Clinton supporter. (Photo by Mike Windle/Getty Images for WE Day )
Actress and screenwriter Lena Dunham campaigns for U.S. Democratic presidential candidate Hillary Clinton at Eight Seven Central screen printers in Des Moines, Iowa, January 9, 2016. REUTERS/Brian C. Frank
Singer Katy Perry, center, holds a sign in support of Hillary Clinton, former U.S. secretary of state and 2016 Democratic presidential candidate, as Clinton speaks at the Jefferson-Jackson Dinner in Des Moines, Iowa, U.S., on Saturday, Oct. 24, 2015. With Vice President Joe Biden officially out of the presidential race, the nation's first nominating contest between front-runner Clinton and Senator Bernie Sanders is gaining steam, according to a new Bloomberg Politics/Des Moines Register Iowa Poll. Photographer: Daniel Acker/Bloomberg via Getty Images
Senate Minority Leader Harry Reid, seen here working with Clinton when they were Senate colleagues, was an early supporter of the former secretary of state. (REUTERS/William Philpott WP/SV)
Actress Kerry Washington, seen here at a 30th anniversary presentation at the 2015 Film Independent Spirit Awards, is a Clinton supporter. (Adrees Latif / Reuters)
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The NBC News|SurveyMonkey Weekly Election Tracking poll was conducted online August 22 through August 28, 2016 among a national sample of 24,104 adults who say they are registered to vote. Respondents for this non-probability survey were selected from the nearly three million people who take surveys on the SurveyMonkey platform each day. Results have an error estimate of plus or minus 1.0 percentage points. For full results and methodology, click here.

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