Poll: Trump leads top 2020 Democrats in Iowa

The top Democratic presidential candidates trail President Trump in Iowa, according to a new poll.

Trump is leading all of his potential challengers in head-to-head matchups, but South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegSanders says idea he can't work with Republicans is 'total nonsense' Sanders defends Castro comments in wake of backlash from some Democrats Candidates face pressure to exit presidential race MORE fared the best. The mayor is in a statistical dead-heat with Trump based on an Emerson poll released Tuesday.

Trump has a slim 1 percentage point lead over Buttigieg — 46 percent to 45 percent — that's within the poll's 3 point margin of error.

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Former Vice President Joe BidenJoe BidenSanders defends Castro comments in wake of backlash from some Democrats Klobuchar releases medical report that says she's in 'very good health' Candidates face pressure to exit presidential race MORE is the next closest Democrat, trailing Trump by 4 points. Trump has 49 percent support to Biden's 45 percent.

The president leads both Sens. Elizabeth WarrenElizabeth Ann WarrenCandidates face pressure to exit presidential race Buttigieg proposes undoing SALT deduction cap Bloomberg called Warren 'scary,' knocked Obama's first term in leaked audio MORE (D-Mass.) and Bernie SandersBernie SandersSanders says idea he can't work with Republicans is 'total nonsense' Sanders defends Castro comments in wake of backlash from some Democrats Sanders releases list of how to pay for his proposals MORE (I-Vt.) by 7 points, with Trump at 50 percent support to their 43 percent.

Trump has extended his lead over Democrats since a March poll by Emerson. Sanders bested Trump by 2 points at the time, and the president led Biden and Warren by just 2 points. The matchup results in March were also within the poll’s margin of error.

Despite being the strongest candidate against Trump in the most recent head-to-head matchups, Buttigieg trails both Biden and Sanders in Iowa.

The two Democratic front-runners in the poll are neck and neck for the top spot, with Biden at 23 percent and Sanders at 22 percent. Buttigieg was the favorite for 18 percent of voters polled.

Warren has dropped to fourth in the Emerson poll, at 12 percent support. 

The poll was conducted Dec. 7-10 among 1,043 voters.