Hillary Clinton has taken a seven point lead over Donald Trump on the latest national poll of voters.

The Fox News poll gives Clinton 45 per cent of the four-way presidential preference vote while Trump has slid to 38 per cent.

He has dropped four points since the network's last poll taken before the release of videos in which he made lewd comments towards women.

However other polls indicate an increase in the businessman's support.

The latest survey carried out by pollers Rasmussen Reports said Trump had the support of 43 per cent of likely voters. Clinton had 41 per cent.

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Hillary Clinton (above on Thursday) has taken a seven point lead over Donald Trump in a recent national poll of likely voters

Fox News gave the Democratic candidate 45 per cent of the vote with its poll on Thursday

In its last survey, the company reported a seven point Clinton lead in its last survey. It was the first of their polls since the release of Trump's comments in a 2005 Access Hollywood appearance.

It did not factor in any from the debate, however, suggesting his performance in St Louis, Missouri, may have won him back some straying followers.

In the Fox News poll, Libertarian Gary Johnson has seven per cent of the vote while Green Party candidate Jill Stein gets 3 percent.

Clinton has climbed ahead just one point from 44 per cent. In the two-way preference between her and Trump, she had an eight point lead with 49 per cent of the vote over his 41 per cent.

Since early June, the number of likely voters who believed Trump would win the election has almost halved from 40 to 23 per cent.

Asked how qualified each of the candidates are to become president, 49 per cent said 'not at all' for Trump. Forty-two per cent said Clinton was 'very' qualified.

In one of the most startling responses, 77 per cent said he is not a good role model for children.

Trump took the lead in a separate poll, carried out by Rasmussen Reports, itching ahead of Clinton by two points with 43 per cent of the vote to her 41

Clinton steamed ahead of Trump in a Bloomberg poll of voters in Pennsylvania, one of the states which could determine the election's outcome.

There, she was named by 51 per cent of voters as their preference. Forty-one per cent named Trump.

The Los Angeles Times has the candidates locked in a dead heat, both holding 44 per cent of the vote.

NBC put Clinton ahead in North Carolina by four points with 45 per cent to Trump's 41 while in Ohio he holds a one point advantage (42-41 per cent).

A Reuters/Ipsos poll gave her a seven point lead of 44 to Trump's 37 per cent. Ten days ago she held the same lead with 48 per cent to his 38.

Between October 5 and 9, 49 per cent said they would vote for Clinton while only 36 per cent gave their support to Trump in a poll carried out by The Atlantic.

Clinton has a lead of 6.2 per cent over Trump in an average of national head-to-head polls, CBS reported.