Senator Scott Brown today sent a letter to his Democratic challenger, Elizabeth Warren, demanding that she release a list of her corporate legal clients while she has served as a Harvard Law School professor.

He cited media reports this year about her work on cases involving Travelers Insurance and LTV Steel, which he said conflicted with her reputation as a consumer advocate and middle-class guardian.

“Taken together with your refusal to satisfy media demands for a full six years of tax returns and your refusal to release your university personnel files, these new revelations leave voters with a disturbing and confusing picture of whose interests you really represent,” Brown wrote.

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“During this campaign, you have accused others of siding with big corporations. As it turns out, you are the only candidate in this race who has stood on the side of large corporate interests over the middle class,” added Brown, a Republican seeking his first six-year Senate term after winning a 2010 special election.

The Warren campaign was reviewing the letter before offering a response.