WASHINGTON D.C. (ABC4) – Senator Lindsey Graham (R-SC) has tested positive for COVID-19.

Graham, who is vaccinated, announced the diagnosis Monday.

“I started having flu-like symptoms Saturday night and went to the doctor this morning,” he says in a post to Twitter. “I feel like I have a sinus infection and at present time I have mild symptoms.”

The Republican senator from South Carolina continues, saying he will enter quarantine for 10 days.

“I am very glad I was vaccinated because without vaccination I am certain I would not feel as well as I do now. My symptoms would be far worse,” he adds.