Donald Trump is dominating another new poll

Donald Trump has rocketed to the top of another major poll.

A new Wall Street Journal/NBC poll released on Sunday showed the real-estate mogul jumping to the front of the pack with 19% of the Republican primary vote. He snatched the top spot away from former Florida Gov. Jeb Bush (R), who led the last WSJ/NBC poll taken in June.

The poll - which was conducted after Trump's controversial comments about Sen. John McCain's (R-Arizona) war record - is only the latest to show Trump's support surging among GOP primary voters.

A Reuters poll released last week week had him leading with 25% support among primary voters nationally, while several major polls of key primary states also have shown Trump in the lead.

As the Wall Street Journal notes, the latest poll shows shows that Trump is starting to perform better by several key metrics. According to the poll, beyond the 19% of primary voters who had Trump as their first pick, 11% picked Trump as their second choice candidate, which the Journal notes is up from just 3% who picked him second in June.

There are a few caveats. The Journal/NBC poll of Republican candidates has a margin-of-error of plus-or-minus 6%, a figure made particularly significant due to the fact that support is spread thin over the large Republican field.

It's also unclear whether Trump's popularity can be sustained for a lengthy period of time.

As many pollsters and observers have pointed out, Trump's high name recognition and ability to garner media attention provides an advantage this early in the race.

With over four decades in the spotlight as a businessman and reality television star, most Americans know Trump far more than other candidates like Wisconsin Gov. Scott Walker (R) and US Sen. Marco Rubio (R-Florida), who are both considered front-runners by many GOP strategists.

And Trump is still unpopular with most voters. Few Republicans say that they trust Trump, and HuffPost pollster estimates Trump's unfavorability among Republican primary voters sits at 43%, a far higher number than all of his Republican rivals.

The polls have held a lot more weight in this year's Republican primary race because both Fox News and CNN are using an average of several national polls to determine which of the 17 candidates get a spot on the debate stage.