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(WGHP) — Sen. Lindsey Graham on Monday confirmed he has tested positive for COVID-19, despite being vaccinated.

Graham (R-SC) said he started having flu-like symptoms on Saturday night and went to the doctor on Monday morning.

“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,” Graham tweeted.

Graham said he will be quarantining for 10 days.