Lev Parnas, a Donald Trump contributor indicted on campaign finance charges , is seeking to release even more records that are essential to the presidents impeachment inquiry, Parnas attorney argued in a letter Saturday to a judge.

Parnas, a close business associate of Trump personal attorney Rudy Giuliani , won permission from U.S. District Court Judge Paul Oetken last week to give lawmakers access to his phone records and other documents seized by federal investigators when he was arrested in October. The House Intelligence Committee subpoenaed the records as part of its impeachment investigation, according to Parnas attorney, Joseph Bondy.

Now, he wants to release additional records from two cellphones and an iPad to the House Intelligence Committee, according to a court filing.

Review of these materials is essential to the Committees ability to corroborate the strength of Mr. Parnas potential testimony, his attorney wrote in the letter.

Parnas and Igor Fruman, who has also been charged with campaign finance violations, last year helped Giuliani launch an investigation into unfounded accusations against former Vice President Joe Biden and his son Hunter in Ukraine. Trumps pressure on Ukraines president to also launch a probe into his political rival while he was withholding U.S. military funds led to the presidents impeachment.

Its not clear how the new records would be used, since the House has already impeached Trump . He next faces a Senate impeachment trial. Senate Majority Leader Mitch McConnell (R-Ky.) has indicated no witnesses will be called in the trial and the process will be speedy.

Parnas and Fruman were indicted for alleged federal campaign finance violations linked to a large donation they made to a group supporting Trumps reelection campaign. Prosecutors allege they funneled foreign money through a bogus energy company, thereby making illegal donations to U.S. politicians on behalf of foreign interests. Both men have pleaded not guilty.