Democrats also raised concern about the fund’s role in the possible influence of witnesses. Ethics rules ban contacts between the manager of a legal defense fund and those aided by the fund. But Democrats warned that a loophole would still let the fund manager contact Trump campaign representatives, who could, at the same time, remain in touch with fund recipients.

“The agreement does not address the potential for pressure to be placed on potential recipients before they testify,” the Democrats said. “The agreement also does not prohibit communications between the manager of the fund and campaign representatives who are themselves under investigation.”

A group of Wiley Rein lawyers sent a draft agreement of the Patriot defense fund to the ethics office on Jan. 29 after discussions with agency officials. The fund was officially unveiled in late February. Wiley Rein has deep expertise in election law and several partners have a history of ties to Republican administrations and the GOP.

A firm member involved in setting up the defense fund declined to comment on the House Democrats’ letter.

According to the draft, the fund would “be operated as a political organization,” with its donations listed in total in annual filings with the IRS. Previous defense funds, such as two 1990s-era funds for former President Bill Clinton and former first lady Hillary Clinton, had voluntary caps on the size of donations. The Patriot fund does not appear to have any limits on the size of donations.

The draft explicitly says the fund was “formed to provide assistance paying legal expenses for persons involved in the investigations by special counsel Robert S. Mueller III,” House and Senate inquiries into Russia meddling and any other congressional probes.