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When Ms. Banks received an email from a reporter with The Washington Times about Cherita Whiting, a Gray appointee who turned out to have a criminal record, Ms. Banks sent an e-mail to Ms. Green that said, “This is not good.”

Ms. Green is scheduled to testify May 13 before the committee. Process servers also are looking for Mr. Brown and Ms. Whiting to subpoena them ahead of the hearing.

Mr. Brooks and his son, Peyton Brooks, who resigned from a city job, have exercised their Fifth Amendment rights to remain silent.

Meanwhile, at the request of Mr. Catania, Ms. Cheh will issue a subpoena for all the emails from Ms. Banks’ brief tenure in Mr. Gray’s administration.

Ms. Cheh also gave Ms. Banks an opportunity to correct her testimony, should her own recollection change.

Ms. Webb, who was dismissed by the mayor last month, attended the hearing to follow developments. She said she was surprised that Ms. Banks is “still clinging to her story.”

“They don’t want the truth to come out,” she said.