- The incident took place in May
- Pepper spray and ammunition was found nearby
Jesse Olivieri, the 31-year-old from Pennsylvania who brandished the weapon
, admitted to "resisting or impeding certain officers or employees," according to the Office of the U.S. Attorney for the District of Columbia. Olivieri probably will be imprisoned for between eight and 14 months, the Justice Department said in a press release.
Prosecutors said he was holding a silver handgun as he approached the building.
"Secret Service officers repeatedly ordered him to stop, but he ignored their commands and continued to walk toward the White House," according to the statement. "At that point, a Secret Service agent confronted him, again ordering him to halt and drop the weapon. When Olivieri refused, the agent shot him once."
Olivieri also stashed 15 rounds of additional ammunition and pepper spray in his vehicle, and a shell casting was later located nearby, authorities said.
A message left with Olivieri's attorney, Loui Itoh, was not immediately returned Tuesday.
Because Olivieri is still recovering from the shooting, his plea hearing had to take place in a local hospital.
A sentencing date has not yet been set, but he faces a maximum of 20 years in prison.