Poll: Trump gains among independents against Biden, Warren

President TrumpDonald John TrumpTrump denies telling Bolton Ukraine aid was tied to investigations Former senior Senate GOP aide says Republicans should call witnesses Title, release date revealed for Bolton memoir MORE is gaining among independent voters in head-to-head matchups with the Democratic presidential front-runners, according to a new IBD-TIPP poll.

Former Vice President Joe BidenJoe BidenTrump denies telling Bolton Ukraine aid was tied to investigations Former senior Senate GOP aide says Republicans should call witnesses Title, release date revealed for Bolton memoir MORE leads Trump by just 1 point among independents, which is down from Biden's 18-point lead among the voting group in September.

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In a head-to-head matchup with Sen. Elizabeth WarrenElizabeth Ann WarrenPoll: Sanders leads Biden by 9 points in Iowa Poll: Biden leads in Iowa ahead of caucuses The Memo: Impeachment dominates final Iowa sprint MORE (D-Mass.), 49 percent of independents backed Trump, while 43 percent threw their support behind the senator in the poll, which was released on Monday. 

A 4-point gap separated Sen. Bernie SandersBernie SandersPoll: Sanders leads Biden by 9 points in Iowa Poll: Biden leads in Iowa ahead of caucuses The Memo: Impeachment dominates final Iowa sprint MORE (I-Vt.) and Trump, with the president receiving 48 percent support among independents and Sanders garnering 44 percent. 

Warren led Trump with independents by 2 points in the September poll, while Sanders led the president by 9 points. 

The new poll comes as tensions between Trump and Biden have risen on the campaign trail as the president has intensified his attacks against the former vice president, accusing Biden of efforts to pressure Ukraine to dismiss a senior prosecutor who at one point had investigated an energy company where Biden's son had served as a board member.

There is no evidence that Biden advocated for the prosecutor's removal as a means of protecting his son. 

Independent voters will likely play an impactful role in the 2020 general election. Forty-three percent of voters who said they identified as independent said they voted for Trump in 2016, while 42 percent went for Democratic nominee Hillary ClintonHillary Diane Rodham ClintonGOP senator says idea that Ukraine interfered in US election is 'not a conspiracy theory' Cotton: Democrats are 'upset that their witnesses haven't said what they want them to say' Trump's troubles won't end with a Senate acquittal MORE, according to the Pew Research Center.

The IBD-TIPP poll was conducted from Sept. 26 to Oct. 3 among 900 adults. The margin of error is plus or minus 3.3 percentage points.