A group of activists is urging Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE to challenge the results of the presidential election in three states, New York Magazine reported Tuesday.

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The group of election lawyers and computer scientists says Clinton, the Democratic nominee, should call for a recount in Wisconsin, Michigan and Pennsylvania. They claim election results in those states could have been manipulated or hacked.

The group includes voting-rights attorney John Bonifaz and J. Alex Halderman, the director of the University of Michigan Center for Computer Security and Society.

The activists had a conference call last Thursday with Clinton campaign chairman John Podesta and campaign general counsel Marc Elias to discuss their findings, which they have not made public.

The group found Clinton got 7 percent fewer voters in Wisconsin counties that used electronic voting machines instead of optical scanners or paper ballots, according to the magazine.

As a result, Clinton could have reportedly not received as many as 30,000 votes, which could have cost her the state, the publication reported. Clinton lost Wisconsin by about 27,000 votes.

The group is saying the pattern should be looked into, though it has not found proof of hacking.

President-elect Donald Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE currently has 290 electoral votes and Clinton has 232. Trump won Wisconsin and Pennsylvania, and Michigan has not yet officially been called for either candidate.

The deadline to file for a recount in Wisconsin is Friday; in Pennsylvania is Monday; and in Michigan is Nov. 30, according to the publication.

Ahead of the election, election authorities and cybersecurity experts said a concerted effort to change the outcome of the election through a cyberattack is nearly impossible.

When Trump said during his campaign that the election could be rigged, election officials scoffed at the claims, noting the country's use of a decentralized system in which ballots are counted by thousands of Democratic and Republican officials across the country.

The decentralized system acts as a barrier to widespread fraud.