BATON ROUGE, La. — U.S. Sen. Bill Cassidy announced Thursday that he has tested positive for the coronavirus and is experiencing some COVID-19 symptoms. He said he is quarantining in Louisiana.

The Republican senator, 62, who is running for reelection on Nov. 3, is experiencing “mild symptoms that began this morning,” from COVID-19, the illness caused by the virus, his spokesperson said. Cassidy is at least the 13th member of Congress known to have tested positive for the coronavirus and only the second senator.

Cassidy, a physician from Baton Rouge who regularly wears a mask when in public and on Capitol Hill, said in a statement that he was tested after being notified Wednesday night that he’d been exposed to someone infected with the virus. The senator said he is adhering to medical guidance and notifying people with whom he may have come into contact.

Cassidy’s announcement came a day after he was in north Louisiana, visiting a veterans hospital in Shreveport, where he posted a photo with an official from the facility.

His positive test comes as some Senate Republicans have pressured Majority Leader Mitch McConnell to boost testing for senators.