A longtime ally of Hillary ClintonHillary Diane Rodham ClintonYang expands campaign with senior hires for digital operations Top GOP legislator in California leaves party GOP senators request interview with former DNC contractor to probe possible Ukraine ties MORE on Monday refused comment on whether the FBI has interviewed him about her use of a private email server while secretary of State.

“You know, I don’t really want to talk about an ongoing inquiry right now,” Sidney Blumenthal told host Chris Matthews on MSNBC’s “Hardball."

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Blumenthal said he would refrain from sharing further details until investigations of the Democratic presidential front-runner have concluded.

“Well, my feeling about it is that let’s wait and see at the end, and see what happens to everybody involved in it, and see what the resolution is, and then I would like to see the Department of Justice issue a very transparent report,” said Blumenthal, who served as an aide to President Bill ClintonWilliam (Bill) Jefferson ClintonThe Hill's Morning Report — Pelosi makes it official: Trump will be impeached Impeachment can't wait Turley: Democrats offering passion over proof in Trump impeachment MORE, Hillary Clinton’s husband.

“I have been urging transparency. I urged that my deposition before the Benghazi Committee be made public the second I walked out. I wanted it to be a public hearing, and not a private one.”

The FBI formally confirmed its investigation of Clinton’s email practices as secretary of State in a letter released last February.

FBI Director James Comey said last month that his agency feels no pressure to conclude its probe before the Democratic National Convention in July.

“The urgency is to do it well and do it promptly,” he said on April 5. "And ‘well’ comes first. [I’m staying] close to this one to make sure we have the resources to do it competently.”

Clinton said last week the FBI has not yet contacted her over her personal server and said that no evidence exists that hackers had compromised it.

Clinton has repeatedly denied any wrongdoing with her server and has said it was never used to send classified information.

Critics say Clinton’s use of a private email server at State potentially jeopardized sensitive national intelligence.