Andrew Weissman has led the fraud section at Justice, where he oversaw probes into corporate wrongdoing at Volkswagen and Takata.
Weissman is the highest-ranking Justice Department official to join the special counsel office being set up a few blocks from the main Justice building in downtown Washington. John Cornyn, R-Texas; Alice Fisher, the former head of the Justice Department's criminal division; and Michael Garcia, a former US attorney from Manhattan. On several occasions, Comey reportedly wrote that Trump either asked for his loyalty or pressed him to drop the investigation into his disgraced National Security Advisor Michael Flynn.
On Tuesday, Flynn's legal team sent the committee a letter informing them that he would be providing documents in response to the Senate subpoenas for business records and a narrowed subpoena for personal records, according to a person close to Flynn.
The open hearing is scheduled to being at 10 a.m. and will be followed by a closed session at 1 p.m., according to an advisory from the committee.
Rep. Jason Chaffetz, R-Utah, the committee chairman, said in response that he would not push the matter.More news: Former White House press officer Boris Epshteyn questioned in Russia probe
Comey could appear before the Senate Intelligence Committee as soon as next week; however, the details have not been finalized.
It's those memos that will likely feature in Comey's testimony to the Intelligence Committee.
The hammer could begin to fall on Trump in one week, as former FBI Director Comey will give Congress credible testimony about Trump's personal attempts to obstruct the Russian Federation investigation.
The Associated Press has learned of Flynn's cooperation that was the first signal that he and the Senate panel have found common ground.
Mr Flynn resigned in February after it was revealed that he had misled Vice President Mike Pence and other top White House officials about his conversations with Sergey Kislyak, the Russian ambassador to the US.
FILE - In this December 16, 2016, file photo, Michael Cohen, an attorney for Donald Trump, arrives in Trump Tower in NY. American intelligence officials have said that Moscow sought to impact the 2016 election.