(CNN) Former Vice President Joe Biden received Secret Service protection starting Tuesday, sources familiar with the matter told CNN.

The development comes with Biden knocked off the campaign trail amid concerns about the coronavirus pandemic, instead holding online events for voters and donors.

"The U.S. Secret Service can confirm Acting Secretary of Homeland Security, Chad F. Wolf, along with the Congressional Advisory Committee has authorized that the Secret Service provide physical protection for presidential candidate, former vice president Joseph Biden," a Secret Service spokesperson said in a statement. "As a matter of practice and for operational security reasons, the Secret Service does not discuss our protectees, protective means, methods and or protective responsibilities."

Biden's Secret Service code name will be "Celtic," according to two sources familiar with matter, which was his code name as vice president.

Biden's campaign would not confirm that he is receiving Secret Service protection or comment on the matter.

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