Opposition to Brett Kavanaugh's nomination to the Supreme Court increased in the days following his hearing before the Senate Judiciary Committee last Thursday, according to a Reuters/Ipsos poll.

The latest seven-day average of the Reuters/Ipsos survey of U.S. adults showed 41 percent of respondents opposed Kavanaugh's nomination, while 33 percent supported it and 26 percent said they did not know.

That marked an increase of 4 points in those who oppose Kavanaugh's nomination from the period before the hearing, according to the survey.

At the Sept. 27 appearance before the Senate committee, Kavanaugh strongly denied sexual assault allegations levied by college professor Christine Blasey Ford earlier in the hearing.

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The rise in opposition to his nomination appears to be primarily driven by those who previously had expressed no opinion on the nomination, as those who said they were not sure about it fell 7 points.

Independents are the most undecided about Kavanaugh, with 49 percent still unsure about whether he should be named to the Supreme Court. Among the rest, 31 percent of independents say they are opposed to the judge's nomination compared to 20 percent who support it.

Meanwhile, support for Kavanaugh's nomination rose 4 points among Republicans, while opposition rose 6 points among Democrats during the same time.

The Reuters/Ipsos poll was conducted online among 4,057 U.S. adults, including 1,347 Republicans and 1,653 Democrats. The poll's credibility interval is 2 percentage points.