Senator Ron Johnson, a Republican from Wisconsin, has tested positive for COVID-19, his office announced Saturday morning. Johnson is the third GOP senator to report a positive diagnosis since Friday, following President Donald Trump‘s own positive test results.

“Senator Johnson feels healthy and is not experiencing symptoms,” his office said in a statement. “He will remain isolated until given the all-clear by his doctor.”

Johnson, 65, was exposed to someone who tested positive for COVID-19 on September 14, according to the statement. The senator quarantined for two weeks and tested negative twice during that time.

After returning to Washington on September 29, Johnson was exposed to someone who has since tested positive, the statement read.

“After learning of this exposure, the senator was tested yesterday afternoon. This test came back positive,” according to the statement.

Wearing a face mask to reduce the risk posed by the coronavirus, Sen. Ron Johnson (R-WI) departs a Republican senate luncheon in the Hart Senate Office Building on Capitol Hill September 16, 2020 in Washington, DC. Chip Somodevilla/Getty

It is unclear who Johnson might’ve contracted the virus from when he was reportedly exposed Tuesday.

Price & Product Availability Tracker

Discover where products are available & compare prices

Meanwhile, Republican Senator Mike Lee of Utah announced his positive diagnosis Friday. Thom Tillis, a GOP senator from North Carolina, tweeted out his positive results Friday evening.

This is a developing story and will be updated throughout the day.