White House spokeswoman Jen Psaki. (Photo: news.sky.com)

Psaki, 42, who stated she was vaccinated and experiencing mild symptoms, said she and the president sat outside more than 1.8 m apart and wore masks on Tuesday. Biden tested negative for COVID-19 on Saturday, said a person familiar with the matter.

Psaki, the main spokesperson for the White House, is the most high-profile person in the Biden administration known to have contracted COVID-19 since he took office in January.

Psaki decided not to join Biden on his trip to Rome and Glasgow this week because a member of her household tested positive for the virus, after which she quarantined, she said.