House Intelligence Committee Chairman Adam Schiff Adam Bennett SchiffChris Matthews ripped for complimenting Trump's 'true presidential behavior' on Ginsburg Trump casts doubt on Ginsburg statement, wonders if it was written by Schiff, Pelosi or Schumer Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence MORE (D-Calif.) announced a series of hires Tuesday, including a former prosecutor with experience combatting Russian organized crime, to lead his investigation of the Trump administration.

Daniel Goldman, who served as an assistant United States attorney in the Southern District of New York (SDNY) from 2007 to 2017, joined the committee's staff as a senior adviser and the director of investigations in February.

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Goldman oversaw prosecution against against more than 30 defendants involved in Russian organized crime for racketeering, gambling and money laundering during his time at the SDNY.

"I am excited to announce the recent addition of a number of capable individuals to the HPSCI leadership team, as we continue our important work of strong and effective oversight of the nation's intelligence agencies," Schiff said of the new hires in a statement.

"I look forward to working with them to perform important oversight and investigative work to ensure the security of our country and its institutions."

Goldman's hiring underlines Schiff's desire to pursue investigations into potential collusion between President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE's 2016 campaign and Russia.

Schiff's committee concluded its investigation into Russia's election interference last year when it was controlled by Republicans, but Schiff and other Democrats have disputed that result.

Last month he announced a sweeping probe into Trump's potential ties to Russia, focusing on five key areas.

The areas are: matters directly related to Russian interference, possible coordination between the Trump campaign and Moscow, whether a foreign actor has sought to compromise or holds leverage over Trump, whether Trump or anyone in his orbit are under foreign influence, and whether any actors are trying to "impede" or "obstruct" investigations into these matters.

Trump has denied any accusations of collusion, calling investigations a "witch hunt."

The Senate Intelligence Committee chairman has said his panel, after two years of looking, has yet to find direct proof of collusion.

Special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE is also investigating allegations of collusion, and is reportedly planning to conclude his probe shortly.