Pundits and politicians mostly scoffed at the notion of large-scale voter fraud because the facts do not support those accusations. Another variable became apparent when WikiLeaks introduced private emails that they allegedly obtained through Russian sources. US Government Investigators confirmed that indications pointed to efforts by the Russians and sources close to Vladimir Putin to interfere in the American election process.
How were they doing that? First, evidence now shows that there was a concerted "fake news" campaign directed to undermine Hillary Clinton. Other, less conspicuous indicators lay in the cyber world where some computer experts believe that some outside source attempted to manipulate election results at voting locations in the US.
If any political party, elected official, or voters had any indication about the following, the proper action would be to call law enforcement and initiate legal action:
1. Donald Trump alleged widespread voter fraud.
2. Hillary Clinton alleged Russian interference in collaboration with WikiLeaks.
3. Both now claim possible manipulation of results and voter fraud.
Since Hillary Clinton conceded the election to Donald Trump, there are new data and evidence that characterize the process and cast doubt about the outcome.
1. The national vote tabulations indicate that Hillary Clinton won the popular vote by a significant margin.
2. Indications in some states where the vote count are statistically close point to possible irregularities.
President-elect Trump's response is mixed, claiming that he disputes the national tabulation and claims to be the victor of the popular vote. Why does it matter? It matters because a big win in the popular vote may constitute a mandate for Trump policies that he otherwise would not have.
Trump claims that the national count is inaccurate. If so, then he should call for a recount. He doesn't because he has already won the electoral college vote, and that is definitive.
However, if there is fraud, manipulation, or inaccuracies in competitive states, then a recount is warranted. Before moving on, part of the American process is to get the count correct.
It isn't so much a question about rigging as it is about getting an accurate count of the votes. Is there evidence of wrong-doing?