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 has reached the highest lead over his 2020 Democratic presidential competitors since April, according to a CNN poll released Wednesday.

Biden received 34 percent support from those surveyed that identified as Democratic and Democratic-leaning voters. Behind the former vice president, 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.) are about neck and neck with 19 percent and 16 percent support, respectively.

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The 15-point lead represents Biden's largest since just after he announced his run on April 25. The former vice president gained support from moderate and conservative Democrats, racial and ethnic minorities and older voters since last month’s poll.

South Bend, Ind., Mayor Pete Buttigieg (D) and Sen. Kamala Harris Kamala HarrisTexas Democratic official urges Biden to visit state: 'I thought he had his own plane' The Hill's Campaign Report: Biden on Trump: 'He'll leave' l GOP laywers brush off Trump's election remarks l Obama's endorsements A game theorist's advice to President Trump on filling the Supreme Court seat MORE (D-Calif.) follow behind the front-runners with 6 percent support each. Sen. Amy Klobuchar Amy Klobuchar3 reasons why Biden is misreading the politics of court packing Social media platforms put muscle into National Voter Registration Day Battle lines drawn on precedent in Supreme Court fight MORE (D-Minn.) and former Rep. Beto O’Rourke (D-Texas) both received 3 percent of the vote.

Respondents also tabbed the former vice as the best candidate to handle foreign policy, economy, immigration and gun policy. He led Sanders by 3 percentage points as the best candidate to handle health care and ties with the Vermont senator on the climate crisis.

Biden’s lead in the CNN poll comes as 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 and Republicans have ramped up attacks against the presidential candidate, specifically regarding his family’s relationship with Ukraine.

A call in which Trump asked Ukrainian President Volodymyr Zelensky to look into the Bidens' interactions in the country is at the center of the House impeachment inquiry against Trump.

There has been no evidence that Biden or his son violated laws in their interactions with Ukraine.

The CNN poll was completed by SSRS from Oct. 17 to 20 surveyed 1,003 adults, including 424 registered voters who identify as or lean Democrat. The margin of error is plus or minus 3.7 percentage points for the overall poll and plus or minus 5.8 percentage points among possible Democratic voters.