Hillary Clinton’s lead over Mr Trump in the popular count of the US presidential election has increased to two million votes and there have been renewed calls to challenge the result in three swing states won by Trump, according to a BBC report.
A group of academics, lawyers and data experts is also trying to persuade the Clinton team to join their effort to investigate the results in Michigan, Pennsylvania and Wisconsin states to check there was no foreign computer hacking that manipulated the outcome.
They are curious why Ms Clinton performed worse in counties that relied on electronic voting machines compared to paper ballots and optical scanners.
But her campaign has not indicated any interest in joining a fight for a recount.
The Green party candidate, Jill Stein, is raising funds to request a recount in the same states – Michigan, Wisconsin and Pennsylvania, all won by Mr Trump.
Trump won the election by winning a majority of the electoral college votes, but with ballots still being counted two weeks after election day, the Cook Political Report has Mr Trump’s tally at 62.2m and Mrs Clinton’s at 64.2m.
It is the fifth time the winner of the popular vote has lost the election.
In 2000, Democrat Al Gore’s final lead over George W Bush, who won the election after a prolonged legal challenge, was nearly 544,000.
The Supreme Court ultimately decided that election by awarding Mr Bush a win in the contested state of Florida.
This year, Mrs Clinton scored large tallies in states like California but Mr Trump won most of the so-called swing states, which ultimately decide the outcome of elections.
The electoral college system favours candidates who win by a small margin in lots of states over ones that win by a landslide in just a few.