Clinton comes out ahead, 43-39, in a head-to-head match. When third-party candidates are included, Clinton maintains a four-point lead at 42-38, with Libertarian Gary Johnson behind at 6 percent and Green Party candidate Jill Stein polling at 2 percent.
The former Secretary of State's lead shrunk slightly from Ipsos/Reuter's poll release last week, conducted in the midst of increasing allegations of sexual misconduct and assault aimed at Trump, as well as the second presidential debate.
Last week's poll showed Clinton +7, while she now leads +4 in both the head-to-head and four-way races.
The Ipsos/Reuters tracking poll was conducted online from Oct. 13-17 among 1,190 likely voters nationwide, with a margin of error of plus or minus 3.2 percent.
TPM's PollTracker Average for the general election shows Clinton leading Trump, 48.8 to 40.1.