Republicans have indicated they will try to block one of the top economic advisers proposed by Joe Biden in what could be his administration’s first major confirmation battle.
Mr Biden named 50-year-old Neera Tanden on Monday as the first woman of color to serve as director of the Bureau of Management and Budget.
Ms Tanden has led a liberal think tank for the past decade and is a former close associate of Hillary Clinton.
She sharply criticized Republican senators, including leader Mitch McConnell, accusing him of “breaking our democracy”.
A spokeswoman for Republican Senator John Cornyn accused her of “an endless stream of derogatory comments” and said she “had no chance of being confirmed.” Mr McConnell’s former chief of staff said Ms Tanden would be a “sacrifice to the gods of confirmation”.
This happened when Mr Biden first received the Presidential Daily Brief, giving him an update on classified intelligence.
This should include the latest US intelligence assessments of the assassination of Iranian nuclear scientist Mohsen Fakhrizadeh.
The president-elect also revealed his economics team, including confirmation that he is appointing Janet Yellen, former Federal Reserve chairperson, as treasury secretary.
He also appointed an all-female White House communications team with Jen Psaki as the press secretary.
Ms. Psaki worked in the administration of Barack Obama and contributed to CNN.
Ms Tanden’s confirmation appeared to depend on who wins two Senate second-round races in Georgia on January 5.
If Democrats win both races, they’ll take control of the Senate from Republicans, making the confirmation process easier for Biden officials.
As the battle in Georgia intensified, its Secretary of State Brad Raffensperger opened investigations into left-wing groups trying to recruit new voters.
He said some groups have encouraged people living outside Georgia to register to vote in the state.
Ms Tanden is also unpopular with some on the left wing of the Democratic Party.
Last year, Bernie Sanders accused her of “slandering my staff and supporters and belittling progressive ideas.”