Biden, Sanders edge Trump in hypothetical 2020 matchups in Fox News poll

President TrumpDonald John TrumpDemocrats' CNN town halls exposed an extreme agenda Buttigieg says he doubts Sanders can win general election Post-Mueller, Trump has a good story to tell for 2020 MORE narrowly trails former Democratic Vice President Joe BidenJoseph (Joe) Robinette BidenButtigieg says he doubts Sanders can win general election This is the Joe Biden you rarely see Minorities, older adults push Biden to top of 2020 poll MORE and Sen. Bernie SandersBernard (Bernie) SandersDemocrats' CNN town halls exposed an extreme agenda Buttigieg says he doubts Sanders can win general election Meghan McCain: Bernie Sanders supporting prisoners being able to vote 'bats**t insane' MORE (I-Vt.) in hypothetical 2020 presidential election matchups, according to a Fox News poll released Sunday.

The poll shows that Biden leads Trump by 7 percentage points among registered voters when the two go head-to-head. The former vice president has not yet officially announced his candidacy but is widely expected to do so.

Sanders is the only other candidate for the Democratic nomination to top Trump in a hypothetical head-to-head matchup. Forty-four percent of those surveyed backed the Vermont senator, compared to 41 percent who support the president.

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Trump edges out Sens. Kamala HarrisKamala Devi HarrisDemocrats' CNN town halls exposed an extreme agenda The Hill's Morning Report - Will Joe Biden's unifying strategy work? K Street support to test Buttigieg MORE (D-Calif.) and Elizabeth WarrenElizabeth Ann WarrenDemocrats' CNN town halls exposed an extreme agenda Minorities, older adults push Biden to top of 2020 poll The difference between good and bad tax reform MORE (D-Mass.) by 2 percentage points each in their respective head-to-head matchups, according to the poll.

A steadily growing field of Democrats has taken shape to seek to the party's nomination to take on Trump in 2020. Former Rep. Beto O'RourkeRobert (Beto) Francis O'RourkeOvernight Defense: 2020 Dems rebuke Trump on Iran deal | Trump appeals ruling on male-only draft | Kudlow claims Iran sanctions won't hike oil prices Castro wants to follow Obama's lead on balancing presidency with fatherhood Poll: Buttigieg tops Harris, O'Rourke as momentum builds MORE (D-Texas), Sen. Amy KlobucharAmy Jean KlobucharDemocrats' CNN town halls exposed an extreme agenda Spicer: 'Near impossible' for 2020 Democrats to refuse Fox News debate James Comey, wife donated ,400 to Klobuchar's presidential campaign MORE (D-Minn.) and Sen. Cory BookerCory Anthony BookerK Street support to test Buttigieg We should welcome workers' 'powerful victory' in the Stop & Shop strike Harris adds another to her list of endorsements in South Carolina MORE (D-N.J.) are among the others who have entered the race.

Biden and Sanders have consistently ranked at or near the top of polling among Democratic voters about their preferred nominee. They were the top two vote-getters among 403 Democratic primary voters in the Fox News poll.

Trump has criticized both men, recently deriding Biden as "low I.Q." and previously suggesting Sanders had "missed his time" by failing to secure the nomination in 2016.

The support in the new poll for Trump among those surveyed closely mirrors his overall approval rating, which has hovered in the low 40 percent range for much of his presidency.

The poll surveyed 1,002 registered voters from March 17 to March 20. It has a margin of error of 3 percentage points, meaning each matchup except the one with Biden falls within the margin of error.