A few details are emerging about the alleged armed suspect, who was seen running towards the ballroom at the Washington Hilton before officers stopped him.
The BBC`s US partner, CBS News, reports that the suspect is believed to be a 31-year-old man from Torrence, based in Los Angeles` south-western suburbs in California.
Washington DC mayor said the suspect was receiving treatment in a nearby hospital and remains in police custody.
Todd Blanche, Trump`s Attorney General, said that he would be charged "very soon".