President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE holds strong leads over both former Vice President Joe Biden Joe BidenSenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies Biden says Ginsburg successor should be picked by candidate who wins on Nov. 3 MORE and Sen. Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE (I-Vt.) in potential head-to-head matchups in Iowa, according to a Des Moines Register/Mediacom Iowa poll released Thursday.

Trump leads Biden among likely voters by a 51 percent to 41 percent margin, with 8 percent of voters saying they are undecided in the hypothetical matchup.

Trump gets the support of 53 percent of likely voters in a matchup with Sanders, who gets 41 percent support. Six percent of voters are undecided in a Trump-Sanders head-to-head.

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The president is buoyed by a net-positive approval rating — 50 percent of Iowans approve of the job he’s doing, while 47 percent disapprove. Thursday’s poll marks the first time in which Trump’s approval rating has broken even in the survey.

“That is a high-water mark in the Iowa Poll,” said J. Ann Selzer of Selzer & Co., which conducted the survey.

While Democrats hope to remain competitive in Iowa, the Hawkeye State has trended Republican in statewide contests.

Iowa voted for former President Obama in both 2008 and 2012 but went for Trump by wider margins in 2016 than more solidly conservative states such as Texas.

The Des Moines Register/Mediacom Iowa poll surveyed 667 likely general election voters from March 2-5 and has a margin of error of plus or minus 3.8 percent.