A Fox News poll released Wednesday showed more than half of registered voters do not believe President TrumpDonald John TrumpTrump: 'I will not let Iran have nuclear weapons' Rocket attack hits Baghdad's Green Zone amid escalating tensions: reports Buttigieg on Trump tweets: 'I don't care' MORE will be reelected in 2020.

The poll found that 52 percent of those surveyed do not think Trump will win reelection, compared to 39 percent of registered voters surveyed who believe he will secure a second term. 

Asked who they would vote for if the election were held today, 38 percent of voters said they would support Trump, while 55 percent said they would vote for someone else.

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Thirty percent of respondents said they would “definitely” vote to reelect Trump, compared to 47 percent who indicated they would “definitely” vote for someone else, the poll found. 

A Fox News poll published in December 2010 showed 29 percent of voters thought then-President Obama would be reelected. Obama won a second term in 2012.

Wednesday's poll asked registered Democrats for their opinions on a host of potential 2020 Democratic presidential candidates. Respondents gave the highest marks to former Vice President Joe BidenJoe Robinette BidenButtigieg on Trump tweets: 'I don't care' Buttigieg: The future 'is personal' for me Donald Trump, president for life? We need term limits now MORE and Sen. Bernie SandersBernie SandersButtigieg defends appearing on Fox News: Many Americans don't hear Dems' message Buttigieg: The future 'is personal' for me Donald Trump, president for life? We need term limits now MORE (I-Vt.), the poll found.

The poll surveyed 1,006 registered voters from Dec. 9-11, and has a margin of error of 3 percentage points.

Trump filed paperwork to run for reelection the day he was inaugurated in January 2017. At a press conference last month, Trump asked Vice President Pence to be his running mate in 2020 in an impromptu exchange prompted by a reporter's question.

The president has in recent months attacked a host of potential Democratic challengers in 2020, chastising Biden, Sanders, Sen. Elizabeth WarrenElizabeth Ann WarrenButtigieg jokes about holding town hall same night as 'Game of Thrones' finale Buttigieg defends appearing on Fox News: Many Americans don't hear Dems' message Warren offers to help Twitter user with her love life MORE (D-Mass), Sen. Cory BookerCory Anthony BookerDe Blasio pitches himself as tough New Yorker who can take on 'Don the con' Sanders pledges to only nominate Supreme Court justices that support Roe v. Wade From dive bars to steakhouses: How Iowa caucus staffers blow off steam MORE (D-N.J.) and others on social media and during midterm campaign rallies.

Each of those people is said to be considering a presidential bid, but has not formally announced whether they will run.