What we know so far:

• U.S. President Joe Biden on Thursday unveiled his national strategy for addressing the COVID-19 pandemic. He signed several executive orders including requiring quarantine for international passengers upon arrival and ramping up coronavirus vaccine distribution to meet his goal of administering 100 million doses of two-stage vaccines in his first 100 days in office.

• Biden will also seek a five-year extension to the New START arms control treaty with Russia due to expire on February 5.

• House and Senate on Thursday approved a waiver for Biden's Pentagon chief nominee Lloyd Austin, clearing the way for his confirmation to the job.

• Senate Republican leader Mitch McConnell on Thursday proposed a delay on former President Donald Trump's impeachment trial and asked the House to give Trump two weeks to prepare his case.

• Biden signed a series of executive orders in his first action as president on Wednesday, reversing some of Trump's key policies including rejoining the Paris climate accord.

• Biden has been sworn in as the 46th U.S. president at the Capitol in Washington, D.C. without former President Donald Trump in attendance. 

• Kamala Harris has taken her oath as vice-president, the first woman and first person of color to hold that position.