Hillary Clinton and Donald Trump are now tied in the race for the White House, with Mrs Clinton's poll ratings falling following her near-collapse on Sunday.

In the first poll released since the incident at a September 11 memorial service, Mrs Clinton and Mr Trump both have 46 per cent of support among American voters, when the respondees were asked whether they supported the Democrat, Republican or third-party candidate.

Gary Johnson is running for the Libertarians, and Jill Stein for the Green Party.