The 20-year-old Briton pleaded guilty in September to being an illegal alien in possession of a firearm and disrupting an official function.
Michael Sandford was accused of grabbing a policeman’s gun at a rally in Las Vegas in order to shoot at the candidate.
His mother says “he is remorseful over what he did”.
Micheal Sandford, from Dorking, the UK, had faced up to 10 years in prison over the alleged assassination plot.
The court heard that he could be eligible for release in four months’ time, at which point he will be deported to the UK.
Michael Sandford’s lawyers their client is autistic and suffers seizures and obsession-compulsion anxiety.
After he was arrested, he told officers he had planned to shoot Donald Trump.
Michael Sandford failed to pull the weapon from an officer’s holster, the court heard.
His mother said that she had lost contact with her son after he left home to travel around the US in 2015.
Michael Sandford had previously shown no interest in politics, and she was unable to explain why he would want to shoot Donald Trump.
According to court documents, Michael Sandford, who was homeless and living in the US illegally having overstayed his visa, told the Secret Service that he had driven from California to Nevada with the goal of shooting Donald Trump.
The papers detail how he had been plotting the attack for around a year and had gone to a gun range in Las Vegas the day before the attack to learn how to shoot, firing 20 rounds from a 9mm Glock pistol.
Michael Sandford reportedly told an officer that he had expected to die in the attack but that he also had tickets for a later Trump rally in Arizona in case he needed a second chance.
Judge James C Mahan described the incident as “a crazy stunt”.
“You have a medical problem,” the judge told Michael Sandford, adding that it is “nothing to be ashamed or embarrassed about.”
“I don’t see you as evil or a sociopath,” the judge said, wishing Michael Sandford luck as he rose to leave the courtroom.
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