WASHINGTON - Democrat Joe Biden, the projected winner of the long and contentious U.S. presidential election over Republican President Donald Trump, has moved quickly to start preparations to take over the U.S. government when he is inaugurated January 20 and reverse some key Trump policies.

The move comes as Trump is contesting the outcome of the November 3 election through lawsuits, claiming, without evidence, that vote-counting irregularities in several states where Biden won narrow pluralities and all their electoral votes, would reverse the result and hand him a second term.

Biden Gets to Work on Coronavirus, Transition as Trump Refuses to Concede Defeat

and his running mate, Vice President-elect Kamala Harris, launched on Sunday, saying they would immediately focus on the coronavirus pandemic, the recession in the world’s biggest economy wrought by the pandemic, climate change and systemic racism.

Biden Gets to Work on Coronavirus, Transition as Trump Refuses to Concede Defeat

“We are preparing to lead on Day One, ensuring the Biden-Harris administration is able to take on the most urgent challenges we face: protecting and preserving our nation's health, renewing our opportunity to succeed, advancing racial equity, and fighting the climate crisis.”

Biden Gets to Work on Coronavirus, Transition as Trump Refuses to Concede Defeat

They declared, “We stand together as one America. We will rise stronger than we were before.”

Biden announced Monday the formation of a 13-member coronavirus advisory panel co-chaired by former Surgeon General Dr. Vivek Murthy, former Food and Drug Administration Commissioner Dr. David Kessler and Yale University associate professor and associate dean Dr. Marcella Nunez-Smith.

"Dealing with the coronavirus pandemic is one of the most important battles our administration will face, and I will be informed by science and by experts," Biden said in a statement.

Biden, during the campaign, regularly assailed Trump for his handling of the pandemic as the death toll of Americans rose to a world-leading total of 237,000, according to the Johns Hopkins University. Trump in recent weeks has said the U.S. is “rounding the turn” on COVID-19.

During the past week, the United States averaged more than 100,000 new coronavirus cases per day.

The Biden-Harris transition website lays out a seven-point plan against the coronavirus, including "regular, reliable, and free testing" for all Americans, an "effective, equitable distribution of treatments and vaccines" once they become available and an attempt to implement a nationwide mask mandate that many oppose as an intrusion on their individual freedom.

Aides say that on his first days in office, Biden plans for the United States to rejoin the Paris climate accord that Trump withdrew from and reverse Trump’s withdrawal from the World Health Organization.

Biden plans to repeal the ban on almost all travel from some Muslim-majority countries, and to reinstate the program that allows young people, often called “Dreamers,” who were brought illegally into the U.S. as children, to remain in the country.

During the campaign, Biden also said he plans to rejoin the international accord to restrain Iran’s nuclear weapons development that Trump rebuked and pulled the U.S. from.

U.S. transitions in power can often bring swift policy shifts but the one from Trump to Biden could be among the most jarring in recent U.S. political history.

One Biden aide told CNN, “Across the board we will continue laying the foundation for the incoming Biden-Harris administration to successfully restore faith and trust in our institutions and lead the federal government."

Trump has declined to concede or call Biden.

The Trump campaign is pursuing multiple court cases starting Monday, although there were scant reports of irregularities during last Tuesday’s voting or in the days of vote counting since then, tabulations that are still going on in numerous states even though the outcome in almost all the country’s 50 states is not in doubt.

A majority of 270 votes in the country’s 538-member Electoral College, with the most populous states holding the most sway, determines the outcome of U.S. presidential elections, not the national popular vote. Biden currently holds a 4-million vote edge in the national vote count.

Biden passed the 270-vote Electoral College majority threshold on Saturday when it became apparent he had amassed a narrow, but decisive popular vote lead in the eastern state of Pennsylvania and won its 20 electoral votes.

At that point, all major television news organizations, including Trump favorite Fox News, and leading newspapers, declared Biden the winner.

Trump has railed against the outcome, while praising himself Saturday on Twitter, saying, “71,000,000 Legal Votes. The most EVER for a sitting President!”

Biden currently has 75.2 million votes.