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Michael Sandford has been accused of trying to kill Donald Trump at a rally in Las Vegas.
According to documents filed in court, Mr Sandford tried to take a gun from a policeman, after seeing the weapon in an "officer's holster, in an unlocked position".
He could face 10 years in prison.
ITV News Security Editor Rohit Kachroo reports:
A British man who allegedly tried to grab a police officer's gun at a Donald Trump rally "kept himself to himself," his neighbour in Surrey has told ITV News.
Katrina Gregg says she used to see Michael Steven Sandford "walking up and down the road, mainly at nighttime...the early hours of the morning...waking people up."
She said that the 20-year-old would be with a crowd of people and "wasn't really seen during the daytime."
She said "no one has seen" Sandford for about 12 to 18 months.
After he was arrested at the Republican's rally in Las Vegas on Saturday, Sandford told police that he wanted to shoot the presidential hopeful, court papers say.
He had been planning to shoot the 70-year-old for more than a year after moving to the US, where he was living illegally, the court heard.
Latest ITV News reports
Michael Steven Sandford allegedly tried to wrestle a gun from a police officer at a rally in Las Vegas to kill the presidential hopeful.