Poll: Trump up 8 points in Iowa
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Donald TrumpDonald TrumpConway: Trump doesn't think he's lying on voter fraud, wiretap claims 'The Simpsons' turned down Trump guest appearance on show: producer GOP consultant: Kid Rock would be 'prohibitive favorite' if he enters Michigan Senate race MORE opened up an 8-point lead over Hillary ClintonHillary Rodham ClintonTrump: Democrats, Russians laughing at 'phony Russian Witch Hunt' Scaramucci makes Sunday shows debut with vow to stop WH leaks Trump backers eye GOP primary challenges for Flake, Heller MORE in Iowa, a new poll finds.

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Trump has 45 percent support to Clinton's 37 percent, according to a new Monmouth University survey released Thursday. Libertarian nominee Gary JohnsonGary JohnsonMueller to give first speech since taking on Russia probe Poll: 85 percent of Clinton supporters would vote for her again Open primaries are the answer to America’s election woes — so what are we waiting for? MORE had 8 percent, while Green nominee Jill Stein received 2 percent.

Trump led a July edition of the same poll by 2 points.

The GOP presidential nominee has improved among independent voters, leading Clinton, his Democratic rival, 44 percent to 29 percent.

But both are still plagued by negative favorability ratings.

“Iowa is one of the few places where Trump has been able make inroads among voting blocs that generally support Clinton,” said Patrick Murray, director of the Monmouth University Polling Institute.

Trump has been gaining ground in the polls both nationally and in several battleground states. Clinton now leads Trump by less than 2 points nationally, according to a RealClearPolitics polling average.

Thursday’s poll comes one day after Monmouth University released a poll in Nevada that showed Trump overtaking Clinton by 2 points.

The new poll also showed incumbent Sen. Chuck GrassleyChuck GrassleyFranken: Trump Jr., Manafort need to testify under oath Jill Stein looped into widening investigation of Russia and Trump Jr. connections Grassley calls on 'leaker' to release Sessions-Russia conversation MORE (R-Iowa) up 17 points over his Democratic rival, former Lt. Gov. Patty Judge.

Grassley has 56 percent, with Judge at 39 percent.

Grassley has expanded his lead since July, when he led Judge by 10 points. His favorability rating has also improved, with 50 percent saying they view the GOP senator favorably, while 29 percent view him unfavorably. Judge has a positive favorability rating as well, but she’s relatively unknown; 52 percent have no opinion.

The poll was conducted from Sept. 12 to 14 and surveyed 404 likely voters in Iowa via phone. The margin of error was 4.9 percentage points.