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 trailing the leading Democratic presidential candidates in hypothetical 2020 matchups among Wisconsin voters, according to a new Fox News poll.

The survey, which was released Sunday morning, found 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 leading Trump by 9 points in the key swing state. Sen. 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.) leads Trump by 5 points, while Sen. 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.) holds a 4-point advantage over the president.

WISCONSIN WH’2020 poll (Fox News):

Biden 48

Trump 39



Sanders 45

Trump 40



Warren 45

Trump 41



Trump 44 approve, 54 disapprovehttps://t.co/XOJ3nFeDCf — Reid Wilson (@PoliticsReid) October 6, 2019

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In the matchup between Biden and Trump, 48 percent of respondents said they'd choose the former vice president over Trump if the 2020 election were held today. Meanwhile, 39 percent said they would vote for Trump's reelection.

Sanders and Warren carried 45 percent of the vote in their matchups against Trump. Forty percent of respondents said they'd vote for Trump over Sanders, while 41 percent said they'd pick the president over Warren.

The poll did not survey hypothetical matchups between Trump and other Democratic presidential candidates.

The same survey found that 54 percent of Wisconsin voters disapprove of Trump's job performance. Just 44 percent of respondents said they approved of the job Trump is doing.

The survey was conducted between Sept. 29 and Oct. 2 among 1,512 Wisconsin voters. The margin of error is 3.5 percentage points.

The poll appears to fall in line with other Fox News surveys released in recent months. In August, a national poll from the network found Trump trailing Biden, Sanders, Warren 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.) in hypothetical 2020 election matchups. That survey showed Biden with a substantial 12-point advantage over the president.

"I don't know what's happening with Fox," Trump said after the poll's release, claiming that he didn't believe the results.

"Fox is different. There’s no question about it," he added.

Wisconsin will likely serve as a crucial state for Trump and the Democratic nominee in the 2020 election. Former President Obama earned the majority of the vote in the state in 2008 and 2012. Trump narrowly beat Hillary Clinton Hillary Diane Rodham ClintonBloomberg rolls out M ad buy to boost Biden in Florida Hillicon Valley: Productivity, fatigue, cybersecurity emerge as top concerns amid pandemic | Facebook critics launch alternative oversight board | Google to temporarily bar election ads after polls close Trump pledges to make Juneteenth a federal holiday, designate KKK a terrorist group in pitch to Black voters MORE in Wisconsin during the 2016 election.