Biden's chief of staff Ron Klain 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.
The announcement comes almost a month after US President Donald Trump fired FBI director James Comey, who was overseeing an investigation into possible links between Russia and Trump's election campaign.
Marriages are forced upon children as young as 11 in the US for reasons ranging from religious beliefs to poverty. Activists, some of whom are former victims themselves, are fighting hard for a nationwide law that prohibits the practice.
The US President-elect says he is fully in control and "knows who the finalists are" despite the dismissal of key members of his transition team.
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