Cory Gardner to self-quarantine
© Greg Nash

Sen. Cory GardnerCory GardnerBiden administration reverses Trump changes it says 'undermined' conservation program Gardner to lead new GOP super PAC ahead of midterms OVERNIGHT ENERGY: Court rules against fast-track of Trump EPA's 'secret science' rule | Bureau of Land Management exodus: Agency lost 87 percent of staff in Trump HQ relocation | GM commits to electric light duty fleet by 2035 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 GrahamJohn Boehner tells Cruz to 'go f--- yourself' in unscripted audiobook asides: report Parliamentarian nixes minimum wage hike in coronavirus bill McConnell says he'd back Trump as 2024 GOP nominee MORE (R-S.C.) and Ted CruzRafael (Ted) Edward CruzJohn Boehner tells Cruz to 'go f--- yourself' in unscripted audiobook asides: report Huawei backs supply chain security standards in wake of SolarWinds breach The Memo: Biden faces first major setback as Tanden teeters 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 MnuchinOn The Money: Schumer urges Democrats to stick together on .9T bill | Collins rules out GOP support for Biden relief plan | Powell fights inflation fears Mnuchin expected to launch investment fund seeking backing from Persian Gulf region: report Larry Kudlow debuts to big ratings on Fox Business Network 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.