Biden tells he doesn’t understand why Trump wants to keep his job

US President-elect Joe Biden has blasted Donald Trump for seeking to overturn the November 3 election results, saying the outgoing president spends most of his time "whining and complaining" rather than doing "the work" of his office.

Trump is yet to concede the elections and has filed several lawsuits challenging the November 3 poll results.

He alleges that there was massive voter fraud. Election officials and the media have said that there is no evidence to back his claims. He has also lost dozens of lawsuits.

"The president spends more time whining and complaining than doing something about the problem. I don't know why he still wants the job. He doesn't want to do the work," Biden said on Monday at a drive-in election rally in Georgia where he sought support for two Democratic candidates.