Trump-Biden transition updates: At least 20 arrested, 1 stabbed at DC protests

Pro-Trump protesters were seen gathering in Washington, D.C., on Saturday, cheering Trump's motorcade as it passed. The president on Friday had teased an appearance at planned demonstrations.

Trump was spotted in golfing attire, waving from the motorcade as enthusiastic supporters chanted "USA." 

Supporters also waved Trump flags and carried signs, chanting “Four More Years” and “Stop the Fraud.”

Demonstrators protesting Trump were also seen gathered at Trump National Golf Club as the president's motorcade arrived.

A dinner planned for new members of the House as part of their orientation week Friday night was canceled after backlash on Twitter. 

When a reporter with NBC tweeted a photo of Statuary Hall in the Capitol, filled with tables, and an assurance from House Speaker Nancy Pelosi that it was safe, some saw it as hypocritical for leaders to gather to break bread as Americans were being told it's not safe for them to get together with family for Thanksgiving.

Pelosi's office eventually announced that members wouldn't be having dinner in the Capitol, but taking their boxed meals to go.

ABC News' Benjamin Siegel

Trump’s handpicked representative to accelerate vaccine development, Moncef Slaoui, told the Financial Times that Biden’s team should be given access to information on Operation Warp Speed, the federal government’s program for developing and distributing a coronavirus vaccine, so that it is not slowed down. He called it "a matter of life and death for thousands of people." 

The General Services Administration (GSA), headed by a Trump appointee, has yet to officially recognize Biden as the victor in the election, preventing Biden's team from gaining full access to government funds and security information.

Slaoui said he could not make contact with the Biden team without approval from the White House. 

-ABC News' Anne Flaherty and Claire Brinberg

Trump spoke publicly for the first time since Biden was projected to win the presidential election with remarks in the Rose Garden Friday afternoon on Operation Warp Speed, the federal government’s program for developing and distributing a coronavirus vaccine. 

Picking up where he left off, Trump didn’t directly address the election, but while speaking about lockdowns he appeared to admit he was uncertain about the future of his administration.

“I will not go -- this administration will not be going to a lockdown. Hopefully, the, the -- whatever happens in the future -- who knows which administration it will be? I guess time will tell, but I can tell you, this administration will not go to a lockdown,” Trump said.

Notably, the Biden team is describing its strategy as a "dimmer switch" -- dialing restrictions up and down in hot spots as needed -- not a lockdown.

Trump did not take any questions from reporters.

Outside the White House, crowds of Trump supporters and counter-demonstrators gathered at Black Lives Matter Plaza ahead of expected rallies from far-right groups in Washington, D.C., on Saturday.