The US President's attacked the company behind a potential Covid-19 vaccine.
Pfizer says data suggests its jab could prevent infection in 90-percent of people.
But Donald Trump has accused the firm of not having the 'courage' to announce the update before now - claiming drug officials and Democrats didn't want him to have a 'vaccine win' before last week's election.
Meanwhile, despite no evidence of fraud, the US Attorney General has authorised an investigation into what he calls "substantial allegations" of voting irregularities in the US election.
Democrat Joe Biden won - but President Donald Trump is yet to concede.
His campaign team has continued to make claims about the result's legitimacy.
Fox News - and its anchor Neil Cavuto - earlier cut away from a briefing by White House press secretary Kayleigh McEnany over misinformation:
