WASHINGTON (AFP) - Hillary Clinton got a four-point bounce in support after the Democratic National Convention and now leads Donald Trump by seven points in the race for the White House, a poll released Monday (Aug 1) showed.

Clinton's lead over the Republican Trump is 46 per cent to 39 per cent, according to the CBS News poll.

After the Republican convention, prior to the Democratic one, Trump got a two-point bump and the race was tied, CBS said.

One of Clinton's biggest problems - Americans' negative view of her - remains, but it has eased somewhat since the convention last week in Philadelphia, the survey suggested.

Fifty per cent of registered voters have a negative opinion of Clinton compared to 36 per cent who view her positively, the poll said.

That positive number is up five points and the negative one is down six, it added.

Thirty-one per cent of voters have a positive opinion of Trump, which is about the same as before the Republican convention, according to CBS. Fifty-two per cent see him negatively.

The survey was carried out July 29-31 among 1,393 adults and has a margin of error of three percentage points.