The former head of intelligence law at the National Security Agency (NSA), April Doss, has been hired to work on the Senate Intelligence Committee's investigation into Russia's interference in the 2016 election, her law firm confirmed in a press release on Wednesday.

Doss, who spent over a decade at the NSA and now chairs the Cybersecurity and Privacy practice at Saul Ewing, LLP, will serve as the committee's special counsel as it examines "allegations that Russia participated in a disinformation campaign intended to benefit President Donald Trump, and claims of potential collusion between the Trump campaign and Russia," the firm said.

Doss will join the committee on May 1.

The former NSA attorney testified before the House Judiciary Committee on March 1, 2017 in a public hearing over the reauthorization of Section 702 of the FISA Amendments Act, according to her firm, which hired her one year ago.

"The SSCI investigation is critically important, and it’ll be a privilege to return to public service in this role," Doss said.

A Senate source confirmed to Business Insider that Doss has been hired to work on the investigation but will not be "leading the probe." A source close to Doss said that she was brought on by the committee's Vice Chairman, Democratic Senator Mark Warner, and will be working full time on the committee's Russia investigation.

Doss' hire comes amid reports that the SSCI's Russia investigation has stalled amid partisan bickering and staffing problems, but the source close to Doss said that was not a factor in the decision to bring her on, which has been in the works for about a month.

Yahoo's Michael Isikoff reported earlier this week that, more than three months into the committee's investigation, it hasn't issued any subpoenas or requested any key documents such as emails, memos, and phone records from the Trump campaign, and has essentially descended into a "standoff."

The committee's Russia investigation is also severely understaffed, the Daily Beast and Reuters reported. The seven staffers who are working on it are doing so part-time, and none has relevant legal or investigative experience.

The partisan bickering and lack of resources — problems that have plagued both the House and Senate intelligence committees — have fueled calls from legal and intelligence experts to establish an independent select committee.