Biden spokeswoman Covid positive on eve of Europe trip
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The press secretary said she had held two socially-distanced meetings with Biden, who is vaccinated, a day earlier.
However, "the president tested negative today via PCR test," she said in a statement, adding that Biden, 79, is "not considered a close contact" as defined by the top US health agency.
As a result of the test Psaki will not travel with the White House team Wednesday to Europe for NATO and EU summits on the Russian invasion of Ukraine, and to another summit in Poland.
It is the second time she has had to cancel a high-profile foreign trip due to Covid.
Psaki said she had mild symptoms, for which she credited the Covid-19 vaccine, and said she was working from home.
She planned to return to work in person at the end of a five-day isolation period and a negative test.