WikiLeaks founder Julian Assange says he is looking into hacking Donald TrumpDonald John TrumpCNN's Don Lemon explains handling of segment after Trump criticism NPR reporter after Pompeo clash: Journalists don't interview government officials to score 'political points' Lawyer says Parnas can't attend Senate trial due to ankle bracelet MORE's tax returns.

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“Well, we’re working on it," Assange said Friday night when "Real Time" host Bill Maher asked whether WikiLeaks was looking to target Trump and his tax returns.

WikiLeaks on Saturday denied it was trying to hack Trump's tax returns, dismissing Assange’s comments as "a joke."

"WikiLeaks isn't 'working on' hacking Trump's tax returns. Claim is a joke from a comedy show. We are 'working on' encouraging whistleblowers," the group’s account tweeted.

The GOP presidential nominee has declined to release his tax returns, pushing back on calls in recent months from Democrats and some Republicans. Some have suggested his tax returns show a connection between Trump and Russia.

Trump's campaign chief Paul Manafort said last month the GOP nominee has "said that his taxes are under audit and he will not be releasing them."

"It has nothing to do with Russia, it has nothing to do with any country other than the United States and his normal tax auditing process," Manafort said.

Last month, nearly 20,000 emails from officials at the Democratic National Committee (DNC) were released by WikiLeaks the day before the Democratic National Convention began.

Some of the emails shows DNC officials plotting to undermine the presidential campaign of Bernie SandersBernie SandersNew campaign ad goes after Sanders by mentioning heart attack Biden on whether Sanders can unify party as nominee: 'It depends' Steyer rebukes Biden for arguing with supporter he thought was Sanders voter MORE. They resulted in top officials with the organization stepping down, including chairwoman Debbie Wasserman Schultz.

- Updated at 12:35 p.m.