President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE narrowly trails former Democratic Vice President Joe Biden Joe BidenOmar fires back at Trump over rally remarks: 'This is my country' Trump mocks Biden appearance, mask use ahead of first debate Trump attacks Omar for criticizing US: 'How did you do where you came from?' MORE and Sen. Bernie Sanders Bernie SandersButtigieg stands in as Pence for Harris's debate practice Bernie Sanders warns of 'nightmare scenario' if Trump refuses election results Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda 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.

NEW Fox News Poll shows if the election were held today, registered voters say they would pick @JoeBiden and @BernieSanders over @realDonaldTrump.@ewarren and @KamalaHarris trail Trump narrowly.

(Sanders, Warren & Harris are within the margin of error.) pic.twitter.com/rYXF2hXNR2 — FoxNewsSunday (@FoxNewsSunday) March 24, 2019

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Trump edges out Sens. Kamala Harris Kamala HarrisButtigieg stands in as Pence for Harris's debate practice First presidential debate to cover coronavirus, Supreme Court Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (D-Calif.) and Elizabeth Warren Elizabeth WarrenHarris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda Judd Gregg: The Kamala threat — the Californiaization of America GOP set to release controversial Biden report 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'Rourke Beto O'RourkeJimmy Carter says his son smoked pot with Willie Nelson on White House roof O'Rourke endorses Kennedy for Senate: 'A champion for the values we're most proud of' 2020 Democrats do convention Zoom call MORE (D-Texas), Sen. Amy Klobuchar Amy KlobucharSocial media platforms put muscle into National Voter Registration Day Battle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates MORE (D-Minn.) and Sen. Cory Booker Cory Anthony BookerBipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility 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.