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Yet Mr. Gray has downplayed his relations to Mr. Brooks, who was the subject of a report Monday on WUSA-TV (Channel 9) that said the former campaign staffer had recorded a conversation for prosecutors investigating the Gray campaign, though it was unclear who was on the other end of the recorded conversation.

A. Scott Bolden, a prominent defense lawyer and former prosecutor, said of the recent Brooks revelations: “It suggests he is more than cooperating with investigators, it suggests he is interested in working on his own deal — if he doesn’t have one already. While others have declined to wear a wire, this suggests he was able to obtain further information from targets, subjects and witnesses.

“It suggests he has the most information, and the most to lose.”

Mr. Brooks‘ attorney, Glenn F. Ivey, declined to comment on the recent developments.

Mr. Gray has repeatedly pledged his cooperation with the investigation.

“From the beginning, I called for an investigation into this matter. And from the beginning, I’ve said that if anyone is found to have committed any wrongdoing, then they should be held accountable,” Mr. Gray said in a statement this week.

As for Mr. Brooks‘ involvement, Mr. Manning said, he thinks his brother-in-law is motivated by self-preservation.

“I wouldn’t be surprised at anything he did,” he said. “In order for Howard to wear a wire they’d have to have threatened to indict him or caught him in a lie.”

‘Clear evidence’

The most serious allegations against the mayor’s campaign team stem from Mr. Brown, who says he received cash from Mr. Brooks and the promise of a job from Mr. Gray’s team, although the mayor has said he promised only an interview. Mr. Brown received a $110,000-a-year position at the Department of Healthcare Finance, but was fired in late February over questions surrounding his past and his behavior on the job.

Mr. Brown testified that he met with Ms. Green, then the Gray campaign chairman, in the rotunda of Union Station in the summer of 2010 to lay out his request for a city job and payments to support his own campaign.

He testified that she introduced him to Mr. Brooks, who in turn, he says, provided him with payments, including one in front of Mr. Gray at an Eatonville restaurant on Aug. 4, 2010.

In June, The Washington Post reported that Mr. Brown had provided the newspaper with five money orders totaling more than $600 that represent a portion of the money he says he received from Mr. Brooks.

The money orders are made out to “Sulaimon Brown for Mayor” and include $225 from Mr. Brooks‘ son, Peyton, and other friends and relatives, yet some of the names and addresses are misspelled or incomplete and some of the individuals denied making the payments, the newspaper reported.

Federal investigators obtained fingerprints from Mr. Brooks and Mr. Brown for use in examining crucial documents, The Washington Post reported on Sunday.

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