The ranking member of the House Oversight Committee said Sunday that Congress still doesn't know who directed Deputy Attorney General Rod Rosenstein to write a memo criticizing former FBI Director James Comey. The memo may have led to Comey's dismissal as head of the FBI.

“No, he did not tell us, no, he did not,” Rep. Elijah Cummings (D-Md.) told ABC’s “This Week.”

“You gotta ask him,” Cummings added, when pressed by host George Stephanopoulos on why the deputy attorney general did not disclose who told him to pen the memo.

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Rosenstein, in a memo made public following Comey’s firing, criticized the director's handling of the investigation into Democratic presidential candidate Hillary Clinton Hillary Diane Rodham ClintonHillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters FBI chief says Russia is trying to interfere in election to undermine Biden MORE's handling of classified information.

The White House first pointed to the memo as a reason for Comey’s firing. But Rosenstein, who last week said he stood by the memo, told lawmakers that it was not “a statement of reasons to justify a for-cause termination."

"My memorandum is not a finding of official misconduct; the inspector general will render his judgement about the issue in due course," Rosenstein said last week.

Trump later told NBC of firing Comey: “I was going to fire regardless of recommendation.”