New poll results show that businessman Donald Trump has widened his lead over the other GOP presidential contenders in Illinois.
Victory Research, a political consulting firm, surveyed 801 "likely Republican primary voters" in Illinois from Aug. 16-18, and many of them chose Trump as their candidate.
Trump held 23.3 percent of votes compared to former Florida Gov. Jeb Bush's 16.5 percent and Wisconsin Gov. Scott Walker's 11 percent.
Rounding out the top six in the poll are neurosurgeon Ben Carson (5.5 percent), Florida Sen. Marco Rubio (5 percent) and former Hewlett Packard executive Carly Fiorina (4.6 percent). Less than one-fifth of those surveyed (17.9 percent) said they were still undecided.
The margin of error for the poll is 3.46 percent.
In another poll conducted by Victory Research in July, Trump took an early lead, but he was only ahead by 1.5 percent.
Since the last poll, the GOP candidates engaged in their first live debate and traveled the country campaigning.
Trump has not visited Illinois in the last month, but at the end of June, just two weeks into his presidential run, he spoke at the City Club of Chicago, where he addressed immigration and his recently severed ties with NBC.
Bush has also stayed away from Illinois so far on his campaign trail, but Sen. Walker has visited the state twice in the last month.
Another poll released at the end of July by Public Policy Polling showed Walker leading the race in Illinois, followed by Trump and Bush.