A group of election lawyers and data experts have asked Hillary Clinton's campaign to call for a recount of the vote totals in three battleground states — Wisconsin, Michigan and Pennsylvania — to ensure that a cyberattack was not committed to manipulate the totals reported Chicago Tribune.

There is no evidence that the results were hacked or that electronic voting machines were compromised. The Clinton campaign on Wednesday did not respond to a request for comment as to whether it would petition for a recount before the three states' fast-approaching deadlines to ask for one.

President-elect Donald Trump won Wisconsin and Pennsylvania by razor-thin margins and has a small lead in Michigan. All three states had been reliably Democratic in recent presidential elections.

The group, led by voting-rights attorney John Bonifaz and J. Alex Halderman, the director of the University of Michigan Center for Computer Security and Society, contacted the Clinton campaign this week. That call, which was first reported by New York Magazine, raised the possibility that Clinton may have received fewer votes than expected in some counties that rely on electronic voting machines.

But Halderman, in an article posted on Medium on Wednesday, stressed that the group has no evidence of a cyberattack or voting irregularities. He urged that a recount be ordered just to eliminate the possibility.

"The only way to know whether a cyberattack changed the result is to closely examine the available physical evidence -- paper ballots and voting equipment in critical states like Wisconsin, Michigan and Pennsylvania," Halderman wrote.

Recounts, which are often costly and time-intensive efforts, would likely only be initiated if the Clinton camp pushed for one, though Wisconsin independently announced that it would conduct an audit of its vote. A call for a recount, particularly coming on the heels of a fiercely contested and sharply partisan election, would likely be cheered by Democrats but denounced by Republicans eager to focus on governing.

Trump's campaign had long believed that his message of economic populism would resonate in the Rust Belt. He frequently campaigned in Pennsylvania and made a late push in both Wisconsin and Michigan, successfully turning out white working-class voters whom pollsters may have missed.

Many pre-election polls showed Clinton with slight leads. While advocating for the recounts, Halderman writes that "the most likely explanation" for Trump's surprise win "is that the polls were systematically wrong,"

The deadlines for petitioning for a recount in all three states are in the coming days, with Wisconsin's on Friday. Green Party candidate Jill Stein announced a fundraising effort Wednesday to pay for such recounts.

The focal point of any possible electoral cyberattack presumably would have been electronic voting machines that, whether or not they are connected to the internet, could be infected with malware that could change vote totals. But many of those machines produce a paper record of the vote that could be checked to see if the vote tabulations are accurate.

Hillary Clinton's lead in the popular vote is now nearing 2 million votes, approaching the milestone as the campaign begins to hear from scientists who want to see a recount in several states.

Clinton lost the Electoral College solidly, and the climbing popular vote spread doesn't change anything about who will hold power in Washington. But some Clinton aides and allies have pointed to the gap as a reason to doubt any mandate that President-elect Donald Trump may draw from his victory on Election Day.

As of Wednesday afternoon, Clinton leads Trump by 1.82 million votes, 63,964,956 to 62,139,188, according to preliminary figures according to CNN.

Clinton's loss on November 8 was largely due to underperfomance in a trio of Rust Belt states, Michigan, Pennsylvania and Wisconsin.

Trump won Pennsylvania and Wisconsin, and Michigan remains too close to call, more than two weeks after Election Day.

But a group of scientists are now pressuring the Clinton campaign to challenge those election results and call for a recount, sensing irregularities and possible hackings of vote totals.

Trump, who once criticized the Electoral College as undemocratic, now salutes it as having a "certain genius."

"We actually went to about 22 states, whereas if you're going for popular vote, you'd probably go to four, or three, it could be three," Trump told The New York Times on Tuesday. "You wouldn't leave New York. You'd stay in New York and you'd stay in California."