(CNN) A trio of Republican establishment favorites -- Jeb Bush, Scott Walker and Marco Rubio -- are all losing ground in the party's 2016 presidential field, a new Fox News poll shows.
Donald Trump, meanwhile, continues to dominate the race, earning 25% support nationally, while another outsider, retired neurosurgeon Ben Carson, is running second at 12%. Sen. Ted Cruz of Texas, known for locking horns with Republican congressional leaders, is third at 10%.
Bush, the former Florida governor, has dropped to 9% -- fourth place, down from 15% and second place in a Fox News poll conducted earlier this month, before the first GOP presidential debate.
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