The U.S. Capitol, seen here on April 13, remains closed to public tours and open only to members, staff, press and official business visitors. Al Drago/Bloomberg via Getty Images hide caption

The lack of a widespread testing regimen at the Capitol is in the spotlight as three senators tested positive for the coronavirus in recent weeks. J. Scott Applewhite/AP hide caption

Sen. Michael Lee, R-Utah, speaks during the Senate Judiciary Committee confirmation hearing on Monday. Kevin Dietsch/Pool/Getty Images hide caption

Democrats on the Senate Judiciary Committee display photos of people who have been impacted by the Affordable Care Act, as the lawmakers argue that confirming Amy Coney Barrett to the Supreme Court would be detrimental to health care. Win McNamee/Getty Images hide caption

Sen. Pat Toomey. R-Pa., said he's returning to the private sector instead of running for reelection to his Senate seat. Zach Gibson/Getty Images hide caption

Sen. Ron Johnson, R-Wis., tested positive for COVID-19. Manuel Balce Ceneta/AP hide caption

The lack of a widespread coronavirus testing program for members of Congress and their staff has become stark in the wake of positive tests for the virus. Alex Brandon/AP hide caption

Senate Majority Leader Mitch McConnell of Ky., center, introduced a targeted coronavirus relief bill and said he planned a vote this week on it. Jacquelyn Martin/AP hide caption