Trump at FreedomFest on Saturday in Las Vegas. AP Real-estate magnate Donald Trump is at the top of another new poll of Republican primary voters nationally.

A Fox News poll released Thursday showed the Republican presidential candidate Trump leading a crowded GOP primary field, with 18% of the vote.

Gov. Scott Walker of Wisconsin, who announced his entry into the race this week, also saw a bump. He came in second behind Trump, with 15% of the vote. Former Gov. Jeb Bush of Florida is third with 14%.

Trump and Walker made the biggest advances in the Fox poll over the past month. In a June poll released just before Trump officially announced his candidacy, he garnered 11% of the vote. Walker last month grabbed 9% of the GOP vote.

Trump has been at the center of a media firestorm since announcing his candidacy last month, when he commented that the Mexican government was sending "rapists" and drug runners to the US. He has since doubled, tripled, and quadrupled down on those comments — and more — even as several businesses and organizations have severed ties with him.

But he has spent much of the past month rocketing up in both national and key early-state polls, and he now finds himself at or near the top of several of them.

"I am incredibly pleased that my message is resonating with people all over the United States," Trump said of the Fox News poll in a statement. "There are so many Americans that are ready to make our country great again, and I am the only one who can make it happen. We will bring back the jobs, bring back the money, and bring back the spirit!"

The Fox News poll also found that 44% of all voters — including 70% of Republicans — said they thought Trump was "basically right" that Mexico was sending "rapists" and other criminals to the US. And 59% of Republicans said they admired Trump, compared with 28% who said he was "just a loudmouth."

The new Fox News poll will most likely be the final one from the network before it hosts the first Republican presidential debate on August 6. The top 10 in an average of five recent national polls will make the debate stage.

Rounding out the top 10 in the GOP primary field: