Eliza Collins

USA TODAY

Hillary Clinton’s lawyer Marc Elias responded to Donald Trump’s attacks and unsubstantiated charges of voter fraud Sunday night.

"We are getting attacked for participating in a recount that we didn't ask for by the man who won election but thinks there was massive fraud," Elias tweeted.

The president-elect went on a tweet storm Sunday afternoon over the news that the Clinton campaign had joined Jill Stein’s recount efforts in Wisconsin. The Green Party candidate has initiated a recount in Wisconsin and pledged to do so in Michigan and Pennsylvania, all states where the margin of votes between Trump and Clinton are relatively small. Unofficial vote tallies show Trump won in Michigan by less than 12,000 votes, Wisconsin by less than 30,000 and Pennsylvania by less than 70,000.

Trump's win in those states were all upsets that helped him win the electoral college vote and ultimately the presidency. Clinton is currently ahead of Trump in the popular vote by more than 2 million.

In the series of tweets, Trump said he would have won the popular vote had millions of illegal immigrants not voted and if he had been able to campaign in other states.

Trump: Clinton won popular vote because millions 'voted illegally'

There is no evidence to support Trump’s claim that millions of undocumented immigrants skewed the popular vote for Clinton. Trump could have campaigned in any state he wanted; he chose not to actively campaign in California and New York.

Elias, who acted as general counsel for the Clinton campaign, announced over the weekend that his team would join Jill Stein in the Wisconsin recount.

"Because we had not uncovered any actionable evidence of hacking or outside attempts to alter the voting technology, we had not planned to exercise this option ourselves, but now that a recount has been initiated in Wisconsin, we intend to participate in order to ensure the process proceeds in a manner that is fair to all sides," Elias wrote on Medium on Saturday. "We feel it is important, on principle, to ensure our campaign is legally represented in any court proceedings and represented on the ground in order to monitor the recount process."

Clinton campaign to participate in Wis. election recount