Biden's plan is the polar opposite of Donald Trump, whose successful 2016 presidential campaign rested in part on curbing or stopping illegal immigration.
President-elect Biden underscored the urgency for vaccinations and congressionally approved aid, as the nation approaches a year since the onset of a public health crisis that has killed more than 390,000 Americans with confirmed infections reaching almost 25 million.
"On Inauguration Day, President-elect Biden will sign roughly a dozen actions to combat the four crises, restore humanity to our immigration system, and make government function for the people", Klein said.
Ali Noorani, head of the National Migration Forum, who was among those briefed on Thursday evening, said migrants would be placed on an eight-year path to citizenship.
All eyes will be on the US Capitol once again this week, this time to see new Joe Biden inaugurated as the 46th president of the United States.