A majority of independent voters say they will not vote for President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE in 2020 but are undecided on which 2020 Democratic candidate to support, according to a new NPR–NewsHour–Marist poll released on Monday.

The poll found that only 33 percent of independents said they would definitely vote for the president in 2020, while 54 percent said they would definitely vote against him.

Thirteen percent of independents said they were unsure if they would vote for the president.

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But independents are yet to coalesce around a Democratic challenger: 84 percent of independents said they had not yet made up their mind on which 2020 Democratic presidential candidate they would support.

Only 15 percent said they knew who they would support.

The poll also found 44 percent approve of President Trump, his highest approval rating since the poll has been conducted, while 52 percent disapprove of his job performance

The poll was conducted one day after Trump tweeted that progressive Reps. Alexandria Ocasio-Cortez Alexandria Ocasio-CortezOn The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline McCarthy says there will be a peaceful transition if Biden wins Anxious Democrats amp up pressure for vote on COVID-19 aid MORE (D-N.Y.), Rashida Tlaib Rashida Harbi TlaibTrump attacks Omar for criticizing US: 'How did you do where you came from?' George Conway: 'Trump is like a practical joke that got out of hand' Pelosi endorses Kennedy in Massachusetts Senate primary challenge MORE (D-Mich.), Ilhan Omar Ilhan OmarOmar fires back at Trump over rally remarks: 'This is my country' Trump attacks Omar for criticizing US: 'How did you do where you came from?' Democrats scramble on COVID-19 relief amid division, Trump surprise MORE (D-Minn.) and Ayanna Pressley Ayanna PressleyFauci, Black Lives Matter founders included on Time's 100 Most Influential People list Trump attacks Omar for criticizing US: 'How did you do where you came from?' Pressley applauded on House floor after moving speech on living with alopecia MORE (D-Mass.) should "go back" to "the totally broken and crime infested places from which they came."

The tweet sparked outcry from Democrats, including presidential candidates, and concern among Republicans, who have since expressed worry about the impact of Trump's tweets and the subsequent "send her back" chant about Omar days later at a Trump rally.

While a number of Republicans may be worried about the impact of Trump's tweets among independents, the survey does not necessarily bode well for Democratic presidential hopefuls, who are still making their cases to voters in the months before the primary contests next year.

The NPR–News Hour–Marist poll was conducted from July 15 to 17 among 1,346 adults. The margin of error is plus or minus 3.5 percentage points.