Cory Gardner to self-quarantine
© Greg Nash

Sen. Cory GardnerCory Scott GardnerDemocrats brace for nail-biting finish to Senate battle Trump expressed doubt to donors GOP can hold Senate: report The Hill's Campaign Report: 2020 spending wars | Biden looks to clean up oil comments | Debate ratings are in MORE (R-Colo.) said Tuesday that he will self-quarantine after coming into contact with a constituent who later tested positive for the coronavirus.

"While I am not showing any symptoms at this time, I have made the decision to self-quarantine out of an abundance of caution with an effective date of March 11 at the recommendation of the Tri-County Health Department," Gardner said in a statement.

Gardner noted that he was alerted on Tuesday by Tri-County Health Department "that a Coloradan who visited my Washington office for a constituent meeting has tested positive for coronavirus."

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Gardner is the latest senator to self-quarantine after coming into contact with an individual who tested positive for the coronavirus. Sens. Rick Scott (R-Fla.), Lindsey GrahamLindsey Olin GrahamThe Hill's 12:30 Report - Presented by Facebook - Election night could be a bit messy The Hill's Morning Report - Sponsored by Facebook - Trump, Biden blitz battleground states Late donor surges push election spending projections to new heights MORE (R-S.C.) and Ted CruzRafael (Ted) Edward CruzHarris to travel to Texas Friday after polls show tie between Trump, Biden Cruz wants donors to repay K he loaned to his 2018 campaign Why Biden could actually win Texas MORE (R-Texas) have also self-quarantined.

Garder was spotted earlier Tuesday in a gaggle with congressional reporters. He also attended a closed-door GOP policy lunch with Treasury Secretary Steven MnuchinSteven Terner MnuchinMnuchin says he learned of Pelosi's letter to him about stimulus talks 'in the press' On The Money: Trump makes a late pitch on the economy | US economy records record GDP gains after historic COVID-19 drop | Pelosi eyes big COVID-19 deal in lame duck Pelosi challenger calls delay on COVID-19 relief bill the 'privilege of politics' MORE.

Two congressional staffers — one in the House and one in the Senate — have tested positive for the virus; no lawmakers have tested positive.

But there are growing concerns about the spread of the coronavirus on Capitol Hill.

The House is on a one-week break and it's unclear when they will return.

Meanwhile, Senate Democrats have been having leadership and caucus meetings via teleconference, and Republicans have moved their in-person meetings to larger rooms to give members more space.