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Mr. Nathan cautioned that the proposals in the mayor’s anticipated legislation are still in their formative stage.

“They are thoughts, and we need to put them on paper and get them accurate,” he told Ms. Bowser.

Council member Tommy Wells, Ward 6 Democrat who called for campaign finance reforms during a sweeping ethics debate last year, praised Mr. Nathan’s proposal but remained skeptical about its prospects for becoming law.

“I would be stunned if the city council passed what you proposed,” Mr. Wells said, saying it would have “to be gutted first” for his colleagues to support it.

But Ms. Bowser expressed a “hopefulness” that the council can reach a consensus on comprehensive reform.