The online poll shows Clinton with 48.36 percent to Trump's 46.05 percent.
Clinton dropped nearly 0.6 percent from Thursday's poll, while Trump held almost exactly steady. Overall, there has been a shift of 0.6 percent upward for Clinton and 2.5 percent down for Trump over the course of a full seven-day sample.
The poll has not yet incorporated data in the wake of Trump's last-minute trip to Mexico or his hardline speech that followed on Wednesday detailing his stance on illegal immigration. Any changes in the electorate based on those news events will not become clear until early next week.
The UPI/CVoter online tracking poll surveys at least 200 people each day, leading to a sample size of roughly 1,400 people during any seven-day span.
Because the poll is conducted online and individuals self-select to participate, a margin of error cannot be calculated. The poll has a credibility interval of 3 percentage points. This seven-day span includes data collected from Aug. 25-31, when 1,705 individuals were surveyed. Of them, 1,173 identified themselves as likely voters.