The Senate race in North Dakota between Sen. Heidi Heitkamp Mary (Heidi) Kathryn HeitkampHarris faces pivotal moment with Supreme Court battle Centrists, progressives rally around Harris pick for VP 70 former senators propose bipartisan caucus for incumbents MORE (D) and Rep. Kevin Cramer Kevin John CramerMomentum growing among Republicans for Supreme Court vote before Election Day On Paycheck Protection Program, streamlined forgiveness is key McConnell shores up GOP support for coronavirus package MORE (R) is all but a toss-up, a poll released Monday found.

The Mason-Dixon poll showed Cramer with a 4-point lead over Heitkamp, which falls within the survey’s margin of error.

Forty-eight percent of voters said they would support Cramer if the election were held today, while 44 percent said they’d back Heitkamp. Another 8 percent said they are undecided.

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The poll surveyed 625 adults in North Dakota between June 13-15. Its margin of error is 4 percentage points.

Heitkamp is among the most vulnerable senators up for reelection in November. President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE won North Dakota in the 2016 presidential election by roughly 36 percentage points over Democratic nominee Hillary Clinton Hillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE.

The president is scheduled to make a trip to Fargo, N.D., on June 27, ostensibly to rally support for Cramer.

It’s true. ⁦@realDonaldTrump⁩ is coming to Fargo June 27th at Scheels Arena. Details coming soon. #MAGA pic.twitter.com/3JcfuMb4Yn — Kevin Cramer (@kevincramer) June 15, 2018

Cramer has recently expressed frustration with Trump's perceived friendly relationship with Heitkamp.

The president called her onto the stage at a tax event in North Dakota last year, and his staff invited her to a bill signing last month at the White House.