A Fox News poll released Thursday showed 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 losing head-to-head matchups against four of the top Democratic presidential primary contenders.

The poll found Trump with 39 percent support among registered voters in head-to-head matchups against Sens. Bernie Sanders Bernie SandersThe Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Bernie Sanders: 'This is an election between Donald Trump and democracy' The Hill's 12:30 Report: Trump stokes fears over November election outcome MORE (I-Vt.), Kamala Harris Kamala HarrisHundreds of lawyers from nation's oldest African American sorority join effort to fight voter suppression Biden picks up endorsement from progressive climate group 350 Action 3 reasons why Biden is misreading the politics of court packing MORE (D-Calif.), and Elizabeth Warren Elizabeth WarrenHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns On 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 Democratic senators ask inspector general to investigate IRS use of location tracking service MORE (D-Mass.). The poll found Sanders beating Trump with 48 percent, Warren winning over Trump with 45 percent and Harris winning with 46 percent support.

Former Vice President Joe Biden Joe BidenPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Fox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio MORE, meanwhile, beat Trump in the theoretical matchup with 50 percent support among those surveyed, compared to Trump's 38 percent.

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Among Democratic primary contenders, Warren saw the largest gain in support in the poll — an 8 percent jump from last month's survey. Warren, according to the poll, took second place behind Biden with the support of 20 percent of Democratic primary voters.

Sanders dropped to third, now at 10 percent in the poll and the only other candidate aside from Warren and Biden scoring double digit support among voters.

Biden dropped slightly in the poll from a previous Fox News poll in July, from 33 percent to 31 percent, but remains the clear front-runner in the race according to the survey.

The Fox News poll was taken between Aug. 11-13 and contacted 1,013 registered voters on landlines and cellphones. The margin of error is plus or minus 3 percent for all registered voters, and 4.5 percent for Democratic primary voters.