Michael Steven Sandford, who prosecutors described as a 19-year-old British national, was arrested on Saturday at the Treasure Island hotel in Las Vegas after trying to disarm the officer, according to Las Vegas police.
"Sandford claimed he had been attempting to kill Trump for about a year but decided to act on this occasion because he finally felt confident about trying it," the court papers said.
He was charged with committing an act of violence on restricted ground, Natalie Collins, a spokeswoman for the U.S. Attorney's Office, said in an email.
Sandford has not entered a plea and is scheduled to be in court for a preliminary hearing on July 5, Collins said. Sandford's federal public defender, Heather Fraley, could not be immediately reached for comment.
Sandford said he had been in the United States for a year and a half, the documents showed. The records said he had lived in Hoboken, New Jersey, after coming to the country.
Court records said Sandford went to the Battlefield Vegas gun range last Friday to practice shooting, adding that he had never fired a gun before. While there, he fired 20 rounds from a Glock 9 mm handgun, the records said.
Sandford told investigators that if he were "on the street tomorrow," he would try again, the documents said.
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