Donald Trump last night began an all-out assault on previously safe Democratic states as he surged back into the US presidential race, claiming he could pull off an upset that would be "Brexit times 10".

Mr Trump began targeting three specific states - Michigan, Wisconsin and New Mexico - as Hillary Clinton continued to reel from the bombshell that the FBI was investigating a new cache of potentially devastating emails.

Storming into Michigan, which last voted for a Republican in 1988, Mr Trump said: "I think we hit the mother lode, as they say. We can be sure that what's in those emails is absolutely devastating.

"Hillary is not the victim. The American people are the victims of a corrupt system. This is your one chance to change it. The Clinton crime spree ends on Nov 8."