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

President TrumpDonald TrumpGrant Woods, longtime friend of McCain and former Arizona AG, dies at 67 Super PACs release ad campaign hitting Vance over past comments on Trump Glasgow summit raises stakes for Biden deal MORE narrowly trails former Democratic Vice President Joe BidenJoe BidenGrant Woods, longtime friend of McCain and former Arizona AG, dies at 67 Sanders on Medicare expansion in spending package: 'Its not coming out' Glasgow summit raises stakes for Biden deal MORE and Sen. Bernie SandersBernie SandersSanders on Medicare expansion in spending package: 'Its not coming out' Briahna Joy Gray: Biden must keep progressive promises or risk losing midterms Overnight Health Care — Presented by Carequest — Study finds Pfizer vaccine almost 91 percent effective for 5 to 11 year olds 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 HarrisObama looks to give new momentum to McAuliffe Kamala Harris engages with heckler during New York speech Biden's safe-space CNN town hall attracts small audience, as poll numbers plummet MORE (D-Calif.) and Elizabeth WarrenElizabeth WarrenSinema's office outlines opposition to tax rate hikes The CFPB's data overreach hurts the businesses it claims to help Runaway higher ed spending gains little except endless student debt 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'RourkeSupport for governors sliding in states without vaccine mandates: survey Abbott bans vaccine mandates from any 'entity in Texas' Abbott disapproval rating up 8 points to 59 percent in San Antonio area: poll MORE (D-Texas), Sen. Amy KlobucharAmy KlobucharGOP blocks Senate Democrats' revised elections bill Progressives push back on decision to shrink Biden's paid family leave program The Hill's 12:30 Report - Presented by Altria - Biden holds meetings to resurrect his spending plan MORE (D-Minn.) and Sen. Cory BookerCory BookerSenate Democrats call for diversity among new Federal Reserve Bank presidents Progressives push back on decision to shrink Biden's paid family leave program Emanuel to take hot seat in Senate confirmation hearing 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.