Republican Donald Trump was rushed off stage by security agents at a rally in Reno, Nevada, on Saturday night after a perceived security threat as he and Democrat Hillary Clinton swept across states that could prove decisive in Tuesday's presidential election.

Two security agents seized Trump by the shoulders and hustled him backstage as police officers swarmed over a white male in the front of the crowd and held him face down on the ground while they searched him.

Moments later, the man was escorted by police away with his hands behind his back. Trump, seemingly unruffled, returned to the stage and continued his campaign speech.