Republican presidential nominee 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 and Democratic rival 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 are in a tight race nationally, according to a new Bloomberg Politics poll.

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In a head-to-head matchup, both candidates are favored by 46 percent of likely voters, according to the poll.

The race has tightened since August, when Clinton had a 6-point lead over Trump.

When third-party candidates are included, Trump has a 2-point lead over the Democratic nominee, 43 to 41 percent.

Libertarian nominee Gary Johnson Gary Earl JohnsonWhat the numbers say about Trump's chances at reelection Presidential race tightens in Minnesota as Trump plows resources into state The Hill's Campaign Report: Biden condemns violence, blames Trump for fomenting it l Bitter Mass. primaries reach the end l Super PAC spending set to explode MORE has the support of 8 percent of likely voters, and Green Party nominee Jill Stein is backed by 4 percent.

Pollsters found that Clinton leads Trump by 13 points among female likely voters, 52 to 39 percent. The Democratic nominee also has a lead over her Republican rival among likely voters under 35, 50 to 40 percent.

The poll also shows that 49 percent of voters think Clinton will perform better in Monday night's first presidential debate, and 39 percent think Trump will do better.

More than 70 percent of respondents think Clinton's truthfulness is "just fair" or "poor." More than 60 percent say the same of Trump.

The poll was conducted from Sept. 21 to 24 among 1,002 likely voters. The margin of error is 3.1 percentage points.

According to the RealClearPolitics average of polls, Clinton has a 2.3-point lead over Trump, 45.7 to 43.4 percent.

Several polls over the last several weeks have shown the race between both major-party nominees tightening. The candidates will go head-to-head Monday night in the first presidential debate.