Graham on 7/30/2021, snarking about the border instead of masking up. Image from: Kevin Dietsch/Getty Images On Monday afternoon, Lindsey Graham posted two tweets informing the public that he has tested positive for COVID. He is fully vaccinated and reports that his case is mild. I was just informed by the House physician I have tested positive for #COVID19 even after being vaccinated. I started having flu-like symptoms Saturday night and went to the doctor this morning. I feel like I have a sinus infection and at present time I have mild symptoms. I will be quarantining for ten days.