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

President TrumpDonald John TrumpTrump's top adviser on Asia to serve as deputy national security adviser United Auto Workers strike against GM poised to head into eighth day Trump doubles down on call to investigate Biden after whistleblower complaint: 'That's the real story' MORE narrowly trails former Democratic Vice President Joe BidenJoe BidenUnited Auto Workers strike against GM poised to head into eighth day Trump doubles down on call to investigate Biden after whistleblower complaint: 'That's the real story' Omar: Biden not the candidate to 'tackle a lot of the systematic challenges that we have' MORE and Sen. Bernie SandersBernie SandersOmar: Biden not the candidate to 'tackle a lot of the systematic challenges that we have' Seven takeaways from a busy Democratic presidential campaign weekend in Iowa Democrats go all out to court young voters for 2020 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 HarrisSeven takeaways from a busy Democratic presidential campaign weekend in Iowa Fracking ban could have unintended consequence of boosting coal Poll: Voters back Medicare expansion, keeping private insurance MORE (D-Calif.) and Elizabeth WarrenElizabeth Ann WarrenUnited Auto Workers strike against GM poised to head into eighth day Omar: Biden not the candidate to 'tackle a lot of the systematic challenges that we have' Seven takeaways from a busy Democratic presidential campaign weekend in Iowa 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'RourkeBeto O'RourkeSeven takeaways from a busy Democratic presidential campaign weekend in Iowa FBI: Arson attacks directed at three Catholic churches in El Paso Toomey on gun reform: 'Beto O'Rourke is not helping' MORE (D-Texas), Sen. Amy KlobucharAmy Jean KlobucharSeven takeaways from a busy Democratic presidential campaign weekend in Iowa MSNBC 'Climate in Crisis' special draws 1.3M viewers in 8 pm timeslot The two most important mental health reforms the Trump administration should consider MORE (D-Minn.) and Sen. Cory BookerCory Anthony BookerSeven takeaways from a busy Democratic presidential campaign weekend in Iowa Iowa GOP swipes at 2020 Democrats' meat positions as candidates attend annual Steak Fry Booker aide sounds alarm about campaign's funding 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.