Hillary Clinton’s huge lead over Donald Trump among millennials is narrowing ahead of the presidential election.

Ms Clinton is still winning significantly among people aged between 18 and 34, according to a new USA Today poll. But that lead – which is a central part of the reason that she has until now been looking like the almost certain winner of the election next week – is getting smaller.

In the last two weeks – a period which has seen new reports of an investigation into Hillary Clinton’s emails, among other stories – Ms Clinton’s lead among millennials has dropped six points, from 68 per cent to 62 per cent.

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Ms Clinton’s lead has been strong among young people for the entire campaign. She has been helped out by high-profile backing from figures including Bernie Sanders and Barack Obama, who younger people rank as the most important endorsements along with those of their parents.

Millennials said that the support of Barack Obama was “very important” to 36 per cent of them. And Bernie Sanders – who initially ran against Ms Clinton but has been active in encouraging people not to vote for Mr Trump – was seen as very important by 26 per cent of people.

Young voters who had backed Mr Sanders said that they thought it significant that he had given Ms Clinton his backing. Among people who supported Mr Sanders, 43 per cent said that it was very important that he had endorsed Ms Clinton.

Mr Trump is backed by only 21 per cent of young voters, and the endorsements that he has been able to make public are far less likely to make an impact. He hasn’t been able to deploy a single high-profile supporter – outspoken backer of Mr Trump Rudy Giuliani is “very important” to only 10 per cent of young Americans, according to USA Today.