House Intelligence Chairman Adam Schiff, D-Calif., said former Deputy Attorney General Rod Rosenstein is being called on to testify before Congress.

Rosenstein "should be brought before both the Judiciary Committee as well as our own committee, and we’re taking steps along that regard," Schiff told MSNBC's Ari Melber at the Center for American Progress' 2019 Ideas Conference in Washington, D.C.

Schiff would not divulge any specific action on what his committee might take. "I am not prepared to comment on where we are in terms of specific witnesses," he said.

However, Schiff did provide a hint. "It would be more than reasonable to infer" a request for a voluntary interview has been sent, the Democrat said.

Schiff indicated he is eager to ask Rosenstein about the memo he wrote that President Trump used to justify the firing of FBI Director James Comey in May 2017.

Rosenstein appointed special counsel Robert Mueller and oversaw his investigation into Russian interference in the 2016 election. Mueller's report, released last month, showed his team did not establish criminal conspiracy between the Trump campaign and the Kremlin, but also did not provide a determination on whether President Trump tried to obstruct the investigation.

Rosenstein left the Justice Department this month and is now a private citizen.

Democrats are engaged in an effort to obtain further information from Mueller's investigation, including seeking the testimony of key players like Mueller and former White House counsel Don McGahn. The Justice Department and House Intelligence Committee struck a deal on Wednesday to allow the panel access to counterintelligence material underlying Mueller's work.