Story highlights For the first time, Donald Trump leads a national poll of the GOP presidential field

Jeb Bush trails Trump by about 3 percentage points, within the poll's margin of error

Washington (CNN) Businessman Donald Trump leads a new Republican presidential nationwide poll released Tuesday, marking the first time he's held the top spot since announcing his candidacy.

Trump secured 17% support, according to the Suffolk University/USA Today survey . Former Florida Gov. Jeb Bush garnered 14%, while the rest of the 2016 field remained in single digits: Wisconsin Gov. Scott Walker, the newest entrant to the race, was at 8%; Texas Sen. Ted Cruz at 6%; Florida Sen. Marco Rubio at 5%; Kentucky Sen. Rand Paul, retired neurosurgeon Ben Carson and former Arkansas Gov. Mike Huckabee at 4%; and New Jersey Gov. Chris Christie at 3%.

All other Republican hopefuls received less than 2% of the vote -- and about one-third of GOP voters -- 30% -- remain undecided about who they will back.

The poll's marrgin of error is plus or minus 5.25 percentage points.

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