Why it matters:If Graham were to test positive for the virus it could delay confirmation hearings on Trump's Supreme Court nominee Amy Coney Barrett.

• Graham, who is the chairman of the Senate Judiciary Committee, has setan Oct. 12 start datefor the hearings.
  
• Sens.Thom Tillis(R-N.C.) andMike Lee(R-Utah), who also serve on the committee, recently tested positive for the coronavirus.
  
• If Graham tested positive, his ability to campaign in person could also be limited, in a race that has become increasingly heated.
  
• The Cook Political Report on Wednesdayupdated its forecastfor South Carolina's Senate race, moving it from "lean Republican" to "toss up."

Background:Graham and Harrison argued on Twitter Thursday night and Friday after the Democrat said he would not participate in the debate unless the senator took a COVID-19 test.

• GrahamaccusedHarrison of "ducking the debate because the more we know about his radical policies, the less likely he is to win. It's not about medicine, its politics."
  
• Graham added that the rules of the debate did not require a COVID-19 test, and hecited a notefrom his doctor that said he did not meet the criteria for needing a COVID-19 test after possible exposure. Last week, Graham said he had tested negative for the coronavirus.
  
• Harrisonquestionedwhy Graham would not take a test when he and the debate moderators agreed to do so.
  
• Harrison later thanked the event organizers for changing the format.

Of note:The pairfaced off behind a plexiglassbarrier in their first debate last Saturday.