Donald Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE has retaken his lead atop the GOP presidential field in Iowa, according to a new poll released Sunday on CBS's "Face the Nation."

Trump is polling at 30 percent in the all-important-early voting state, and enjoys a 9-percentage-point lead over rival Sen. Ted Cruz Rafael (Ted) Edward CruzTrump argues full Supreme Court needed to settle potential election disputes Press: Notorious RBG vs Notorious GOP The Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy MORE (R-Texas) in the CBS News 2016 “Battleground Tracker.”

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The results come several weeks after the same poll found Trump tied at 27 percent with retired neurosurgeon Ben Carson Benjamin (Ben) Solomon CarsonState AGs condemn HUD rule allowing shelters to serve people on basis of biological sex Biden cannot keep letting Trump set the agenda The Hill's 12:30 Report: Trump heads to New Hampshire after renomination speech MORE. Carson has dropped to 19 percent in the new poll.

Cruz picked up some of Carson’s lost support. His 21 percent in the latest poll is a 9-percentage-point boost from that late October poll, which showed Trump and Carson in a dead heat.

According to CBS, Cruz took some key voting groups away from Carson, including evangelicals, Tea Party supporters and older voters.

The new poll is one of several in recent days that have shown somewhat of a resurgence for Trump, who gradually lost ground to Carson throughout October.

Rounding out the top of the Iowa field were Sen. Marco Rubio (R-Fla.) at 11 percent, former Florida Gov. Jeb Bush at 5 percent and former Hewlett-Packard CEO Carly Fiorina at 4 percent.