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

A growing number of Republican senators on Thursday called on the Trump administration to start giving Biden classified intelligence briefings, a sign that support for Trump’s refusal to concede the election may be waning among his allies on Capitol Hill.

GOP lawmakers offered varying degrees of approval for Biden to begin receiving security briefings, with several Trump-aligned senators suggesting that they should begin as a precaution pending official certification of the vote, which could take weeks.

Others, including Sen. Susan Collins of Maine, advocated more forcefully for the administration to move on with the transition and stop blocking the briefings.

"President-elect Biden should be receiving intelligence briefings right now,” Collins said. “That is really important. It is probably the most important part of the transition … because we want the president-elect, assuming he prevails, to be ready on Day One."

-ABC News' Lucien Bruggeman

Biden has spoken with House Speaker Nancy Pelosi and Senate Minority Leader Chuck Schumer on a call in which he urged Congress to pass a bipartisan COVID-19 relief bill during the lame-duck session to help families in need.

The call also seemed to acknowledge the slim margins -- and possible deficits -- Democrats will face in both the House and Senate, with a readout from the Biden campaign saying the three discussed how to find "bipartisan solutions" to pass the big ticket policy proposals Biden's hoping for, pledging they would “stay in close touch in the days ahead."

-ABC News' Molly Nagle

Rep. Max Rose, D-N.Y., has conceded his House race in a Staten Island-based district of New York, to Republican challenger Nicole Malliotakis -- bringing House Republicans to a net a gain of seven seats and counting.

Rose said in a statement Thursday afternoon he had called Malliotakis to congratulate her and vowed a "smooth transition."

Malliotakis, a member of the New York State Assembly, attacked Rose on the campaign trail for his participation in a Black Lives Matter demonstration and accused him of wanting to "defund the police" -- a movement he did not support.

As Democrats continue to fall short of their expected House gains, the GOP win in the competitive district may fuel already rising tensions between centrists and progressives in the Democratic Party.

After traveling from Wilmington, Biden has arrived in Rehoboth Beach, Delaware, where he'll continue meeting with transition advisers, according to the Biden campaign.

The Bidens own a vacation home in the small beach town about 90 miles from their house in Wilmington.