(CNN) The man arrested for trying to disarm a police officer inside a Donald Trump rally in Las Vegas Saturday told authorities he intended to use the gun "to kill Trump," according to a new criminal complaint.

Police arrested the 19-year-old after he attempted to pull a police officer's gun from its holster inside a Las Vegas theater where Trump, the presumptive Republican nominee, was holding a campaign rally.

Police said Michael Sandford, a Briton, struck up a conversation with a Las Vegas Metropolitan Police officer under the pretense that he was seeking to get an autograph. During the conversation, police said Sandford tried to pull the officer's service weapon from its holster.

A court sketch of Michael Sandford.

Other officers also assigned to provide security at the event were quickly able to detain Sandford and authorities said there was no further disruption to the event.

Sandford told police that he drove to Las Vegas from California "to kill Trump," according to the complaint, after hearing a few days earlier in the news that he was expected there.

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