Hillary Clinton. AP A Fox News poll released Friday confirmed what other scientific surveys have found in the aftermath of the first presidential debate: Hillary Clinton prevailed over Donald Trump in the affair, and she has seen a slight overall national bump because of it.

The poll, which was conducted entirely after the debate, found that 61% of voters who watched the debate viewed Clinton as the winner. Just 21% thought Trump came out on top.

Clinton also experienced a slight improvement among likely voters nationally, according to the poll. She was up 5 points in a head-to-head matchup, 49% to 44%, and 3 points in a four-way race that included Libertarian nominee Gary Johnson and Green Party nominee Jill Stein.

Both were improvements for Clinton from the previous Fox News survey, which found Trump leading by 1 point in a four-way race and trailing by 1 in the two-way matchup.

The Fox News survey is especially noteworthy because of the way some of its hosts have referred to online, nonscientific post-debate polls to make the case that Trump came out of the debate victorious. The Trump campaign and its surrogates have also cited those online polls to claim victory.

Dana Blanton, the vice president of public-opinion research at Fox News, wrote a memo to television producers and the politics team this week to remind them that online polls "do not meet our editorial standards." Host Sean Hannity, a vehement Trump supporter, has continued to cite such polls despite the memo.

Respondents from at least five other polls — from CNN/ORC, Politico/Morning Consult, NBC/SurveyMonkey, Public Policy Polling, and Gallup — have all declared Clinton the winner. Gallup found Clinton's perceived debate win to be among the largest in modern campaign history.

The Fox News poll released Friday surveyed 1,009 registered voters from September 27 to 29.