Poll: Trump trails Biden by 6 points nationally

President TrumpDonald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE trails Democratic presidential nominee Joe BidenJoe BidenSenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies Biden says Ginsburg successor should be picked by candidate who wins on Nov. 3 MORE by 6 percentage points in a new Hill-HarrisX national poll less than 50 days away from Election Day.

Forty-five percent of registered voters in the Sept. 10-14 survey said they would choose Biden if the election were held today, a 2 percentage point decrease from the previous poll conducted earlier this month.

By contrast, 39 percent of voters said they'd cast their ballots for Trump, no change from the last survey.

Four percent of voters said they'd prefer someone else as their presidential candidate, a 1 percentage point dip, while another 4 percent said they do not plan to vote.

Eight percent of voters said they were still unsure, a 1 percentage point tick up.

The survey found Biden's lead among senior voters, ages 65 and older, fell 9 percentage points, from a 10 point lead in the Sept. 5-8 poll to a 1 point lead in this most recent study.

The Hill-HarrisX poll was conducted online among 3,758 registered voters between Sept. 10 and 14. It has a margin of error of plus or minus 1.6 percentage points.

— Gabriela Schulte