Trump led Sen. Ted Cruz of Texas by three points in the poll, 30% to 27%. Ohio Gov. John Kasich came in third at 22%, an 11-point gain over the past month.
Rounding out the field was Sen. Marco Rubio of Florida, who was at 20%.
Click through some of Donald Trump's most controversial Tweets:
Craziest Donald Trump Tweets
New national poll suggests the GOP race has been shaken up
I told you @TIME Magazine would never pick me as person of the year despite being the big favorite They picked person who is ruining Germany
I would like to wish everyone, including all haters and losers (of which, sadly, there are many) a truly happy and enjoyable Memorial Day!
Just made the point at #NCGOPcon that "we have to protect our border & I think everyone here knows, nobody can build a wall like Trump!"
My twitter has become so powerful that I can actually make my enemies tell the truth.
China's Communist Party has now publicly praised Obama's reelection. They have never had it so good. Will own America soon.
While Jon Stewart is a joke, not very bright and totally overrated, some losers and haters will miss him & his dumb clown humor. Too bad!
Why is Obama playing basketball today? That is why our country is in trouble!
An 'extremely credible source' has called my office and told me that @BarackObama's birth certificate is a fraud.
Remember, I said Derek don't sell your Trump World Tower apartment...its been lucky for you. The day after he sold it, he broke his foot.
I never fall for scams. I am the only person who immediately walked out of my ‘Ali G’ interview
.@cher--I don’t wear a “rug”—it’s mine. And I promise not to talk about your massive plastic surgeries that didn’t work.
The concept of global warming was created by and for the Chinese in order to make U.S. manufacturing non-competitive.
.@katyperry is no bargain but I don't like John Mayer--he dates and tells--be careful Katy (just watch!).
.@BetteMidler talks about my hair but I'm not allowed to talk about her ugly face or body --- so I won't. Is this a double standard?
It's Thursday. How much money did Barack Obama waste today on crony green energy projects?
Truly weird Senator Rand Paul of Kentucky reminds me of a spoiled brat without a properly functioning brain. He was terrible at DEBATE!
Hey @realDonaldTrump - In case you're looking for that tweet you deleted .. I got it right here. http://t.co/a6F98q5xGU
This very expensive GLOBAL WARMING bullshit has got to stop. Our planet is freezing, record low temps,and our GW scientists are stuck in ice
Everyone knows I am right that Robert Pattinson should dump Kristen Stewart. In a couple of years, he will thank me. Be smart, Robert.
26,000 unreported sexual assults in the military-only 238 convictions. What did these geniuses expect when they put men & women together?
Sorry losers and haters, but my I.Q. is one of the highest -and you all know it! Please don't feel so stupid or insecure,it's not your fault
How amazing, the State Health Director who verified copies of Obama’s “birth certificate” died in plane crash today. All others lived
Discover More Like This
BACK TO SLIDE
The poll found that the race could become even further scrambled should one rival emerge to take on Trump in a theoretical head-to-head race.
Both Cruz and Kasich held 17-point advantages over the real-estate mogul in one-on-one matchups, with each up 57% to 40%. Rubio had a 13-point edge over Trump, at 56% to 43%.
The same poll showed Cruz with a two-point advantage over Trump for first place last month, but that was before Trump's string of wins in South Carolina, Nevada, and in the "Super Tuesday" states. That poll also went against the grain of other surveys, most of which showed Trump ahead by double digits. Trump ripped the poll as a "total joke" last month.
Even this time, the poll served as a stark contrast to a recent ABC News/Washington Post poll, which showed Trump holding a nine-point lead over Cruz. Kasich received just 13% of the vote in that poll.