Iran Press/ America: Joe Biden has tested positive for Covid-19 and is suffering mild symptoms, the White House says.
Karine Jean-Pierre, his press secretary, said the US president was vaccinated and boosted. He has tested positive for Covid twice before.
Mr Biden, 81, was seen earlier on Wednesday visiting supporters in Las Vegas and speaking at an event. He cancelled a campaign speech later in the night.
The illness comes as he faces increasing pressure to step aside because of his age.
US media report that both Senate Majority Leader Chuck Schumer and House Majority Leader Hakeem Jefferies - the top two Democrats in the US Congress - separately met Mr Biden privately and expressed deep concern that his candidacy could negatively impact other House and Senate races.
Ms Jean-Pierre said the president planned to isolate at his home in Delaware while carrying out "all of his duties fully".
The president's doctor, Kevin O'Connor, said Mr Biden had presented with upper respiratory symptoms, including a runny nose and a cough, and had been given his first dose of Paxlovid.
He felt fine during his first event of the day but later tested positive, Dr O'Connor said.
Mr Biden later used X/Twitter to thank everyone for "the well wishes" and said he would "work to get the job done for the American people" while in recovery.
In another tweet his account stated "I'm sick" before replying back "... of Elon Musk and his rich buddies trying to buy this election. And if you agree, pitch in here".
The tweet pointed to a donations portal.
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