Sen. Dick Durbin (Ill.), the No. 2 Senate Democrat, said Sunday that he tested positive for COVID-19, marking the third time he has contracted the virus in the past year.

The diagnosis means Durbin will miss votes in the Senate this week before Congress is expected to break for the month of August.

“Unfortunately, I tested positive for COVID-19 today,” he tweeted. “I’m disappointed to have to miss critical work on the Senate’s NDAA this week in Washington. Consistent with (Centers for Disease Control and Prevention) guidelines, I’ll quarantine at home and follow the advice of my doctor while I work remotely.”