US President-elect Joe Biden will name his first cabinet picks on Tuesday, his chief of staff said, even as Donald Trump continues to evoke unsubstantiated fraud despite growing dissent from within his own party.

Biden has continued his preparations to assume the presidency on January 20 regardless of Trump's moves -- increasingly dismissed by Republicans -- to try to undo the results of the November 3 vote.

"You are going to see the first of the president-elect's cabinet picks on Tuesday of this week," Biden's chief of staff Ron Klain told ABC's "This Week" on Sunday.

He declined to say which posts the president-elect would announce, though Biden said last week he has already decided on a person for the key position of Treasury secretary.

Trump Supporters
Supporters of US President Donald Trump cheer as he passes in the motorcade after golfing in Sterling, Virginia on November 21, 2020 Photo: AFP / ANDREW CABALLERO-REYNOLDS

A growing number of Republicans have either recognized Biden's victory or at least urged the General Services Administration -- the usually low-profile agency that manages the federal bureaucracy -- to release federal funds for the Biden transition.

With Trump refusing to acknowledge the election outcome, Biden and his top aides have been denied briefings on sensitive domestic and foreign policy issues -- most urgently the coronavirus pandemic battering the country.

Former New Jersey governor Chris Christie, who in 2016 advised the Trump transition, said on ABC that the president's legal team was a "national embarrassment" and that it was time for the GSA to release transition funds.

Maryland Governor Larry Hogan, another prominent Republican, said on CNN that Trump was making the country look like a "banana republic." He tweeted later that the president should "stop golfing and concede."

Joe Biden
President-elect Joe Biden leaves after attending mass at Saint Ann Catholic Church on November 21, 2020 in Wilmington, Delaware Photo: AFP / CHANDAN KHANNA

The president has golfed on every weekend day since the election, though he took part virtually this weekend in the conference of the G20 leading economies, addressing fellow leaders Sunday about trade, energy and taxes, the White House said. Trump skipped a session Saturday on the pandemic.

North Dakota senator Kevin Cramer on Sunday defended Trump's insistence on ensuring the election was fair, but added on NBC that it is "past time to start a transition," adding, "I'd rather have a president who has more than one day to prepare."

Representative Liz Cheney, the No. 3 House Republican, said that if Trump's lawyers cannot prove the claims of fraud, the president should be "respecting the sanctity of our electoral process."

And even Representative Devin Nunes, an ardent Trump loyalist, conceded in backhanded language on Fox News that Biden was "the first guy to run a successful campaign from a basement."

Trump again tweeted on Sunday about "massive and unprecedented fraud," an assertion dismissed by a long list of judges in several states.

Trump's latest legal setback came Saturday, when a Pennsylvania judge threw out the president's fraud claims there in a scathing judgment.

Pennsylvania was a must-win state this year, and went solidly into Biden's column after backing Trump in 2016.

Biden supporters
People give a thumbs down as the motorcade with US President Donald Trump passes on the way to the Trump International Golf Club in Sterling, Virginia, on November 21, 2020 Photo: AFP / ANDREW CABALLERO-REYNOLDS

Judge Matthew Brann wrote that Trump's team had presented "strained legal arguments without merit and speculative accusations" in their complaints about mail-in ballots in Pennsylvania.

His ruling paved the way for Pennsylvania to certify Biden's victory there, which is scheduled to take place Monday.

Biden won the state-by-state Electoral College votes that ultimately decide who takes the White House by 306 to 232.

The Electoral College is due to formally vote on December 14, with certifications to take place beforehand.

States' certification of results of their popular votes is usually routine following a US presidential election.

But Trump's refusal to concede has raised concerns that he could cause long-term damage to Americans' trust in the voting system that underlies US democracy.

The judgment in Pennsylvania came hours after Republicans also requested a delay in certification in Michigan, another battleground, in a letter that repeated allegations of irregularities in the state, which Biden won by 155,000 votes.

They requested a two-week delay to allow a full audit of results in Wayne County. Wayne is the state's largest county and home to majority-black Detroit, which Biden won overwhelmingly.

Michigan's board of canvassers, which includes two Democrats and two Republicans, is due to meet Monday to certify the results.

Michigan's Secretary of State Jocelyn Benson has said that audits cannot be conducted until after certification because officials do not have legal access to the documents needed until then.

On Saturday, she posted on Twitter that there had been "no evidence" to draw into question the result of the election.

Biden has so far moderated his criticism of Trump's actions, though he has spoken of "incredibly damaging messages being sent to the rest of the world about how democracy functions," adding: "It's hard to fathom how this man thinks."

Other Democrats have been unsparing in their criticism.

Samantha Power, who was UN ambassador under Barack Obama, told CNN that Trump's failure to allow a smooth transition was "reckless in the extreme," depriving Biden of up-to-date briefings on issues as sensitive as troop levels in Afghanistan and any potential threats to US targets overseas.

"It is the absolute responsibility of the outgoing team" to provide such information, she said.

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