The Service said investigations are ongoing to know the background of the armed man and his potential motive.
Security decisions were marred by confusion, with no single entity overseeing key aspects of the event.
The Secret Service has been accused of negligence by some sections of the public after bullets fired by 20-year-old Thomas Matthew Crooks glazed the ear of Mr Trump.
Mr Khairullah, who organised a press conference on Monday, recounted the events that led to his being placed on the terror list.
Vika Ventures CEO rerouted millions of dollars to several accounts, including personal bank accounts, and used the money for private jet charters, cars, luxury clothing, etc.
Investigators determined the man’s threats of physical harm were credible.
The Trump Organisation is said to have billed the secret service $1,185 per night for hotel rooms occupied by the former president’s protective detail.
“Thanks to the Secret Service, the defendants are now facing federal felony charges,” officials said.
