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Authorities began to investigate Dhingra after he called the George W. Bush Foundation on Aug. 17 and left a "concerning message," the district attorney's office said.

Dhingra had requested the former president to "send one of your boys to come murder me," according to court records. "I want to die by the hands of a white Christian."

Authorities then obtained a search warrant and found a bump stock installed on a colt rifle, a Glock 9-mm pistol, and nearly 300 rounds of ammunition, the district attorney's office said.

Investigators also discovered that Dhingra had previously been committed to a mental institution, which prohibits him by federal law from possessing a firearm or ammunition.

"The four-count indictment, returned yesterday, alleges Ajay Dhingra possessed a machine gun, made two materially false statements in the acquisition of two firearms and unlawfully possessed a firearm after having been adjudicated as a mental defective or who had been committed to a mental institution," the attorney's office said.

If found guilty, Dhingra could face up to 10 years in federal prison and a possible $250,000 fine.