DURHAM, N.H. — Hillary Clinton on Thursday night would not promise to release transcripts of speeches she made to firms such as Goldman Sachs — speeches for which she was paid hundreds of thousands of dollars to deliver.

At a Democratic presidential primary debate here, Mr. Sanders again criticized Mrs. Clinton and cast her as a member of the powerful political “establishment” and said she’s too close to Wall Street to affect change.

Mrs. Clinton denied those charges, but she seemed reluctant to let the American people learn exactly what she told Wall Street executives in private speeches.

Pressed by MSNBC moderators on whether she would voluntarily release transcripts of those addresses, she dodged the question.

“I will look into it. I don’t know what the status is, but I will certainly look into it,” she said.