Republican presidential front-runner Donald Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response 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 Cruz Rafael (Ted) Edward CruzLoeffler calls for hearing in wake of Netflix's 'Cuties' Health care in the crosshairs with new Trump Supreme Court list 'Parks and Rec' cast members hosting special reunion to raise money for Wisconsin Democrats MORE (R-Texas) in second, with 23 percent, Sen. Marco Rubio Marco Antonio RubioFlorida senators pushing to keep Daylight Savings Time during pandemic Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Intelligence chief says Congress will get some in-person election security briefings 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.