Jacinda Ardern tweeted: "Democracy - the right of people to exercise a vote, have their voice heard and then have that decision upheld peacefully should never be undone by a mob."
The session of Congress comes one day after voters in Georgia apparently handed a pair of stunning victories to the Democratic Senate candidates over Republican incumbents.
Republicans hold 50 seats in the 100-seat Senate and a victory in just one of the runoff races would give them a majority and the ability to thwart Biden's agenda.
Markets have been buoyed in recent months by the prospect of Republicans holding the Senate and provide a check on the Democrats but analysts said a "blue wave" scenario has spooked investors.
Trump savaged Republicans who have refused to endorse his baseless claims.
Pro-Trump protesters not quite willing to concede are expected to rally in Washington on Wednesday.
Republican Senator Ted Cruz of Texas is leading a dozen lawmakers in asserting that "allegations of fraud and irregularities in the 2020 election exceed any in our lifetimes"
Including the defense bill, Trump has vetoed nine bills during his four years in the White House. Congress has not previously mustered the votes needed to override any of his vetoes.
Trump's campaign has lost dozens of court challenges in several contested states, with judge after judge saying they showed no evidence of any significant fraud.
Michelle Obama appeared on 12 magazine covers in her two terms as the First Lady from 2008-2016.
A commutation removes the punishment but leaves the conviction in place.
The visit followed the hospital's mask protocols for public speakers, based on the District of Columbia health guidance.
Although the door has all but shut on his efforts to overturn the vote results, Trump has remained defiant.
Ahead of Biden's inauguration one major formality remains, when Congress, presided over by Vice President Mike Pence, opens up and counts the electoral votes on January 6.
The 19-year-old has a separate living room area and a bedroom in the mansion.
Obama's claim comes amid reports that outgoing President Donald Trump's son, Donald Trump Jr., is preparing for a political career.
According to Melania's statement, it is meant to be used solely by first families for "leisure time."
Trump has barely left the White House since Biden was projected winner of the election on November 7, though he has made a number of trips to his nearby golf course.
The staff at Mar-a-Lago in Florida have been making preparations for the arrival of the Trump family.
Losers of US presidential elections traditionally concede almost immediately.
Biden said that in his first 100 days in office he will tackle the Covid crisis.
The sudden break in Trump's dogged attempt to deny Biden's win came after Michigan became the latest state to certify its results.