Factbox: Coronavirus in U.S. Congress - 18 members have tested or been presumed positive

Lee's announcement came within hours of the bombshell news of Republican President Donald Trump's positive test. Lee was one of several prominent people who did not wear masks in a crowd at the White House on Sept. 26 as Trump introduced U.S. Appeals Court Judge Amy Coney Barrett as his Supreme Court nominee. Cassidy, 63, a Louisiana Republican, decided to self-quarantine for 14 days and contact those with whom he may have had contact after testing positive, according to a statement in August.

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