Poll: Clinton, Trump tied nationally
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Republican presidential nominee Donald TrumpDonald John TrumpJustice Department preparing for Mueller report as soon as next week: reports Smollett lawyers declare 'Empire' star innocent Pelosi asks members to support resolution against emergency declaration MORE and Democratic rival Hillary ClintonHillary Diane Rodham ClintonFBI’s top lawyer believed Hillary Clinton should face charges, but was talked out of it Harris adds key Clinton aide, women of color to 2020 campaign: report Democrats more likely Trump's foil, than to foil Trump 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 JohnsonGary Earl JohnsonPotential GOP primary challenger: Trump's 'contempt for the American people' behind possible bid The Hill's 12:30 Report — Presented by Kidney Care Partners — Trump escalates border fight with emergency declaration Former Mass. governor takes step toward Trump primary challenge 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.