The Trump administration has issued subpoenas seeking emails from members of the Clinton campaign and DNC and a review of DNC emails obtained by The Hill, which first reported the request.
The administration has also asked for emails from former FBI Director James Comey, as well as the communications of former Attorney General Loretta Lynch, who was fired in May after a special counsel was appointed to investigate the matter.
The Trump White House has denied any collusion between the Clinton campaigns and Russia.
The House Intelligence Committee is also investigating the matter and has subpoenaed emails from the DNC and campaign chair Debbie Wasserman Schultz.
The White House did not respond to requests for comment.
The House Intelligence report found no evidence that Russia was involved in the hacking of the Democratic National Committee or the release of internal documents that included emails stolen from the emails of Democratic Party officials.
The report found “no evidence of coordination between Russia and the Trump campaign.”
But it also found that the FBI’s assessment of Russian hacking was flawed, saying that its investigation had not found “a clear and convincing pattern or practice of interference in the U.S. election.”