Donald Trump's lead over Hillary Clinton in Texas is down to just 6 points, according to a new poll.

In a new Public Policy Poling survey released Tuesday, Trump leads Clinton 50-44 in a state that GOP nominee Mitt Romney won by 16 points in 2012.

Clinton's closeness to Trump in the reliably red state can be attributed to voters under the age of 65. In that voter bloc, Clinton leads Trump 49-45. Clinton has nearly double the support of Trump with voters younger than 45 years old: 60 percent to 35 percent.

Clinton is also dominating among nonwhites in Texas, a state with increasing racial diversity. She has a 73-21 lead over Trump with non-white voters, and a 68-27 edge with the state's growing Hispanic population.

With white voters, Trump easily leads Clinton, 69-25.

Though Clinton is expectedly unpopular in Texas, so is Trump. Only 36 percent see the former secretary of state favorably, and 40 percent see Trump favorably. Fifty-three percent have a negative opinion of the billionaire businessman.

Trump voters are also inclined to think Clinton's victory will be a result of election rigging. Just 19 percent of Trump voters in Texas believe that if Clinton wins the general election it will be because she got more votes, but 71 percent say it will be because the election was rigged.

"Republicans could have a big Texas problem in the decades ahead," Dean Debnam, president of Public Policy Polling, said in a statement. "The groups Democrats are strongest with are rapidly growing in their share of the electorate, while the voters Republicans rely on the most may not be there in 20 years."

The survey of 944 likely Texas voters was conducted Aug. 12-14. It carries a margin of error of plus or minus 3.2 percentage points.