President Michael D Higgins was allegedly confronted by an angry protester at the Aras last week.
A massive security breach saw a woman getting through and into the office where she verbally attacked Higgins.
The Irish Daily Mail state that the woman drove into the grounds in Phoenix Park and then walked into the President's office.
Gardaí were called but the woman was not arrested.
A source told the publication: "She managed to drive into the Aras undetected. Then she parked up and walked straight in.
"She quickly located the President once inside. This was potentially a major situation."