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The House committee report marked the second time an investigative body failed to find evidence Mr. Gray directly paid Mr. Brown or promised him a job; a D.C. Council committee conducted a similar investigation,

Mr. Issa’s report found Mr. Brown had “limited credibility,” although Gore’s formal admission to five furtive payments totaling $660 directly supports at least some of Mr. Brown’s claims.

The congressman had crafted legislation that would put the District’s hiring practices in line with the federal government’s. But Mr. Brown, the council chairman, assured him that local reforms were under way, prompting Mr. Issa to withdraw the bill and enhance the air of cooperation between the federal and local governments.