Democratic presidential nominee Joe Biden is six points ahead of President Donald Trump nationally, with Biden leading Trump by 45 percent to 39 percent, according to a poll conducted on Tuesday by the Hill-HarrisX.

The poll showed a softening in Biden’s support, marking it two points down the previous Hill-HarrisX poll conducted earlier in September. Furthermore, Biden’s support among voters 65 and older fell by nine points.

Trump’s support was holding firm but not convincing any Independent or other potential swing voters to join him, the poll results also showed.

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