Mark Meadows, the White House Chief of Staff, has been diagnosed with coronavirus.
On election night, Meadows was attending a White House party and was seen without a mask.
On Wednesday morning, he was last seen in public as the president addressed the nation and called for victory in the U.S. election.
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Two senior White House officials confirmed the diagnosis Friday.
28 individuals affiliated with the Trump administration or its contacts tested positive for COVID-19 in late September or early October, according to records.
All have been screened positive for the virus by President Donald Trump and First Lady Melania Trump, Press Secretary Kayleigh McEnany, Trump adviser Chris Christie and others.
According to Johns Hopkins University, the U.S. recorded a third consecutive daily record of new coronavirus cases on Friday.
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In 24 hours, over 127,000 infections were registered, as were 1,149 deaths.