Biden took to Twitter to post a photograph showing their hands clasped together
The enmity also extends into defence and human rights, with Taiwan, Hong Kong and the treatment of China's Muslim Uighur minority all making waves in US.
Addressing an election rally in the battleground state of Iowa, Trump said, "They closed down her account. She's the White House press secretary."
The president is confronted by dire polling numbers ahead of the November 3 election, which comes as the economy struggles to recover from COVID shutdowns.
The White House, in a statement late on Tuesday night, said that the President is improving America's work visa programmes to prioritise the highest-skilled workers and protect the American jobs.
Trump had stage-managed his dramatic, if reckless, reentry to the White House — tearing off his mask before stepping back inside Monday,
Discomfort only increased on Monday with news that press secretary Kayleigh McEnany had tested positive.
The FDA has faced criticism for allowing emergency use of some COVID-19 treatments backed by little evidence.
In a mass email to his supporters after his arrival at the White House, Trump asked them not to be afraid of COVID-19.
McEnany saaid in a statement that she tested positive today morning and is experiencing no symptoms at this time.
Earlier, doctors had said that Trump's oxygen levels had briefly dropped twice in recent days and that he is being treated with steroids.
Trump is 74 years old and clinically obese, putting him at higher risk of serious complications from a virus that has infected more than 7 million people nationwide.
The Trump administration had issued an emergency use authorisation for Remdesivir after the drug showed moderate effectiveness in improving outcomes for patients hospitalised with virus.
Trump's remarks on 'ballots' caused an uproar, with lawmakers from the Democratic Party as well as from the president's own Republican Party rejecting his comments.
The California senator is in a unique role following the death of Supreme Court Justice Ruth Bader Ginsburg on Friday.