President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE is running neck and neck with the top Democratic presidential contenders, according to a new Emerson College poll.

Former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE and Sens. Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.) and Bernie Sanders Bernie SandersSirota reacts to report of harassment, doxing by Harris supporters Republicans not immune to the malady that hobbled Democrats The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election MORE (I-Vt.) all lead Trump by 2 points — 51 percent to 49 percent — nationally, within the poll’s margin of error. No other Democratic candidate was polled in head-to-head match-ups with Trump.

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Tuesday’s survey shows slight improvements for both Biden and Sanders, compared to Emerson's September poll, while Warren's support remains the same. Biden led Trump 50 percent to 49 percent last month, while Sanders trailed Trump by 2 points.

The Democrats are aided by sinking approval ratings for the president. Forty-seven percent of respondents now disapprove of the job he’s doing, while 43 percent approve. Trump’s approval rating was slightly above water last month, with 48 percent approving and 47 percent disapproving.

The new poll comes as the White House faces controversies on multiple fronts, most notably over the House’s impeachment investigation into Trump’s dealings with Ukraine and the president’s decision to withdraw troops from northeastern Syria. Voters in the Emerson survey were slightly in favor of impeaching Trump, with 48 percent in support and 44 percent in opposition. Respondents were split, meanwhile, on the troop withdrawal, 40 percent to 39 percent.

However, the survey shows that impeachment could backfire on Democrats if the president is not convicted in the Senate.

“Impeachment does have the potential to boomerang on Democrats if President Trump is not convicted, as 35% of voters said they would be more likely to vote for President Trump if he is impeached and not convicted, while a lesser 28% saying a lack of conviction would make them less likely to vote for Trump,” said Spencer Kimball, director of Emerson Polling, in a release.

The Emerson College survey polled 1,000 registered voters from Oct. 18-21 and has a margin of error of 3 percentage points.