Senate races in two key states are growing tighter in the final week of the midterm election, according to new polls.

Fox News polls released Wednesday showed margins have narrowed in North Dakota and Arizona, two states that will help determine which party controls the Senate next year.

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In North Dakota, 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-N.D.) is leading Democratic Sen. Heidi Heitkamp Mary (Heidi) Kathryn HeitkampCentrists, progressives rally around Harris pick for VP 70 former senators propose bipartisan caucus for incumbents Susan Collins set to play pivotal role in impeachment drama MORE (N.D.) by single digits at 51 percent to 42 percent among likely voters, according to the Fox News Poll which was conducted by Anderson Robbins Research and Shaw & Company Research.

It's a narrower margin than a Fox News Poll released on Oct. 3, which had Cramer leading Heitkamp by 12 percentage points at 53 percent to 41 percent among likely voters.

The poll was conducted from Oct. 27-30 with live telephone interviews of 789 likely voters and includes a margin of error of 3 percentage points.

In Arizona, the latest Fox News Poll has the race to succeed retiring Sen. Jeff Flake Jeffrey (Jeff) Lane FlakeJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Republican former Michigan governor says he's voting for Biden Maybe they just don't like cowboys: The president is successful, some just don't like his style MORE (R-Ariz.) in a tie with Reps. Kyrsten Sinema (D-Ariz.) and Martha McSally Martha Elizabeth McSallyTumultuous court battle upends fight for Senate Grassley, Ernst pledge to 'evaluate' Trump's Supreme Court nominee The Hill's Campaign Report: Biden goes on offense MORE (R-Ariz.) both at 46 percent among lightly voters.

It's a slightly tighter race than a Fox News poll released on Oct. 3, which had Sinema leading McSally 47 percent to 45 percent among likely voters.

The Arizona poll was conducted between Oct. 27-29 with telephone interviews of 643 likely voters and a margin of margin of error of 3.5 percentage points.

While the Senate races in Arizona and North Dakota have tightened, the race in Missouri between Sen. Claire McCaskill Claire Conner McCaskillMomentum growing among Republicans for Supreme Court vote before Election Day Democratic-linked group runs ads in Kansas GOP Senate primary Trump mocked for low attendance at rally MORE (D-Mo.) and Attorney General Josh Hawley, the GOP candidate, remains unchanged compared to an Oct. 3 Fox News Poll.

McCaskill and Hawley are in a dead heat, which each receiving 43 percent of likely voters, according to the poll, which has a margin of error of 3.5 percentage points.

And in Tennessee, where Sen. Bob Corker Robert (Bob) Phillips CorkerHas Congress captured Russia policy? Tennessee primary battle turns nasty for Republicans Cheney clashes with Trump MORE (R-Tenn.) is retiring, and Indiana, where Democratic Sen. Joe Donnelly Joseph (Joe) Simon DonnellyTrump meets with potential Supreme Court pick Amy Coney Barrett at White House Names to watch as Trump picks Ginsburg replacement on Supreme Court Momentum growing among Republicans for Supreme Court vote before Election Day MORE (D-Ind.) is running for reelection, the Senate races have widened in the final weeks according to new Fox News Polls.

Rep. Marsha Blackburn Marsha BlackburnTaylor Swift on National Voter Registration Day: 'We need everyone' Democrats smell blood with new DHS whistleblower complaint Hillicon Valley: Election officials prepare for new Russian interference battle | 'Markeyverse' of online fans helps take down a Kennedy | GOP senators unveil bill to update tech liability protections MORE (R-Tenn.) is leading former Gov. Phil Bredesen (D) by 9 percentage points at 50 to 41 percent among likely voters. It's a wider margin than the 5 percentage point lead Blackburn had in the same poll released earlier this month.

The poll was conducted between Oc. 27-30, and includes interviews with 718 likely voters. The poll has a margin of error of 3.5 percentage points.

And in Indiana, Donnelly is leading businessman Mike Braun, the GOP Senate candidate, 45 percent to 38 percent among likely voters, according to the Fox News Poll.

The margin is wider than his 2 percentage-point lead he had in a Fox News Poll earlier this month, when he was leading Braun at 43 percent to 41 percent.

The Indiana poll was conducted between Oct. 27-30, including interviews with 722 likely voters and has a margin of error of 3.5 percentage points.