US president-elect Joe Biden will be briefed by national security experts next week amid concerns that Donald Trump's refusal to grant him access to classified intelligence briefings could be a national security risk.

Mr Biden's team is pressing ahead with a transition despite the President's refusal to concede the November 3 election, which major news organisations called for Mr Biden last weekend.

Jen Psaki, an official from Mr Biden's transition team, said the fact the president-elect was not yet receiving classified intelligence briefings could hurt his preparations to govern.

"It's been six days, but with every day that passes on, it becomes more concerning that our national security team and the president-elect and the vice-president-elect don't have access to those threat assessments, intelligence briefings, real time information about our engagements around the world," Psaki said on a call with reporters.

Ms Psaki cited the 9/11 commission report that listed a delayed transition after the 2000 election as a reason officials were not well prepared for the attacks on the United States on September 11, 2001.

A handful of Republican senators have urged the Trump administration to allow Mr Biden to receive presidential daily intelligence briefings, which the president-elect traditionally receives before taking office.

Despite not yet recognising Mr Biden had won the election, Republican senator John Cornyn urged Mr Trump's administration to allow Mr Biden access to presidential intelligence briefings.

"I don't see it as a high-risk proposition. I just think it's part of the transition. And, if in fact he does win in the end, I think they need to be able to hit the ground running," Senator Cornyn told reporters.

Ms Psaki did not name the national security experts who would be brought in to brief the former vice president in lieu of the classified briefings.

Biden still denied access to federal funds

Mr Biden this week formed a taskforce of independent health experts, who are advising him on his plans to fight COVID-19.

The General Services Administration (GSA), the federal agency that releases funding to an incoming president, has not yet recognised Mr Biden's victory, denying him access to federal office space and resources.

Ms Psaki called on the agency's Trump-appointed administrator, Emily Murphy, to sign off on the transition, but said Mr Biden's team was still hoping it would not have to take legal action to make it happen.

Another transition official, Yohannes Abraham, said they were prepared to conduct a transition without the agency's recognition if necessary.

Mr Biden this week held discussions with transition advisers at his homes in Wilmington and Rehoboth, Delaware, on possible cabinet picks.

Ms Psaki declined to comment on specific names under consideration.

Mr Biden has named long-serving aide Ron Klain as his White House chief of staff.

Mr Abraham said the transition team would soon encourage people to apply for jobs in the new administration on its website.

Reuters