Poll: Trump holds 8-point lead over Cruz in Iowa

Republican presidential front-runner Donald TrumpDonald John TrumpMcCabe says he was fired because he 'opened a case against' Trump McCabe: Trump said 'I don't care, I believe Putin' when confronted with US intel on North Korea McCabe: Trump talked to me about his election victory during 'bizarre' job interview MORE holds an 8-point lead in Iowa, just four days before the first-in-the-nation caucuses there, according to a Public Policy Polling survey released Thursday.

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The billionaire businessman secured 31 percent support, followed by Sen. Ted CruzRafael (Ted) Edward CruzEl Chapo's lawyer fires back at Cruz: 'Ludicrous' to suggest drug lord will pay for wall Democrats have a chance of beating Trump with Julian Castro on the 2020 ticket Poll shows competitive matchup if O’Rourke ran for Senate again MORE (R-Texas) in second, with 23 percent, Sen. Marco RubioMarco Antonio RubioRubio in Colombia to push for delivery of humanitarian aid to Venezuela On unilateral executive action, Mitch McConnell was right — in 2014 On The Money: Trump declares emergency at border | Braces for legal fight | Move divides GOP | Trump signs border deal to avoid shutdown | Winners, losers from spending fight | US, China trade talks to resume next week MORE (R-Fla.), at 14 percent, and retired neurosurgeon Ben Carson, at 9 percent.

Former Govs. Jeb Bush (Fla.) and Mike Huckabee (Ark.), along with Sen. Rand Paul (R-Ky.), tie for fifth, with 4 percent each.

The poll also reported a major drop in Cruz's favorability rating since the last PPP poll earlier this month.

The Jan. 12 survey found that 69 percent of Iowans viewed Cruz favorably, but Thursday’s survey shows that number at just 56 percent.

Since then, the Texas senator has been in an escalating feud with Trump. The billionaire businessman has warned Cruz could face legal challenges over his eligibility to serve as president due to his birth in Canada to an American mother.

Cruz has hit back at the front-runner, accusing Trump of cowardice for skipping Thursday evening’s Fox News debate.

The survey found that 31 percent of likely voters said they would still be willing to change their mind about whom to support in the Feb. 1 caucuses.

Public Policy Polling surveyed 780 likely Republican caucusgoers from Jan. 26–27 and has a margin of error of 3.5 percentage points.