One day after testing positive for the coronavirus, Republican U. S. Sen. Chuck Grassley of Iowa said he’s “symptom-free” and continues to feel good.

“I remain symptom free & in isolation. I continue to feel good Thx for all the messages of encouragement & prayers,” Grassley wrote in a tweet Wednesday afternoon.

Grassley is isolating at his Washington, D. C.-area house on his doctor’s orders after announcing Tuesday evening that he had tested positive for the virus.

Grassley, 87, is the Senate’s oldest currently serving Republican and the Senate president pro tempore, making him third in line for the presidency. He was first elected to the Senate in 1980. He is the second-oldest currently serving U. S. senator after Dianne Feinstein, a Democrat from California.

Grassley has not said where he believes he was exposed to the virus. He was most recently in the Senate on Monday, where he made remarks on the floor without a mask on and spoke with colleagues while wearing a mask. He also attended a meeting with Senate Republican leadership on Monday, which includes Senate Majority Leader Mitch McConnell.

McConnell addressed Grassley’s diagnosis in remarks on the Senate floor Wednesday morning. He praised Grassley for setting the Senate record of 27 years without missing a single..