Trump has not conceded the race to Biden, whose transition efforts have been stymied by a key agency's refusal to formally acknowledge him as the winner.
Lewandowski, a top Trump campaign aide helping lead efforts against President-elect Joe Biden, told CNBC "I feel great" when asked about his Covid-19 diagnosis.
Biden campaign officials have been mounting their criticisms of Facebook's handling of the 2020 election, misinformation and its general impact on democracy.
Joe Biden has a solid Electoral College lead over President Donald Trump and could build on that lead once Arizona and Georgia finish counting their ballots.
Obamacare seemed likely to withstand its third challenge at the Supreme Court after Roberts and Kavanaugh expressed an unwillingness to strike it down.
Joe Biden argued for expanding the Affordable Care Act, saying the coronavirus pandemic exposed an urgent need to give more people access to health insurance.