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“They added that they were “grateful” to Republican Sen. Rand Paul of Kentucky, who has raised the questions publicly during recent weeks to pressure the White House on the issue.

Some in the civil liberties community, however, remained highly skeptical. “Instead of a slow drip of information when its back is against the wall, the Obama administration needs to publicly release all … memos on ‘targeted killings,’” said Zeke Johnson, director of Amnesty International USA’s Security With Human Rights Campaign.

While he called the administration’s release of documents to the intelligence committee a step “in the right direction,” Mr. Johnson said it was “far from sufficient to ease concerns about extrajudicial executions.”

Prior to Tuesday’s vote, meanwhile, several Republican senators who are not members of the intelligence committee have said they would try to block Mr. Brennan’s nomination in order to force the administration to answer more questions about last year’s Sept. 11 terror attack on the U.S. diplomatic post in Benghazi.

Sens. John McCain of Arizona, Lindsey Graham of South Carolina and Kelly Ayotte of New Hampshire on Monday published a list of 10 “things we don’t know” about the attack, which killed four Americans.

Mrs. Feinstein said Tuesday that the intelligence committee had made “a number of requests” to the administration related to Benghazi. “I can’t go into it all but it was additional information,” she said, adding that “the administration has provided the great bulk of it.”