The House Ethics Committee deadlocked on Wednesday on whether to release a report about sexual misconduct and illicit drug use allegations against former Representative Matt Gaetz, the Florida Republican who is President-elect Donald J. Trump’s choice for attorney general, setting up a possible constitutional clash between the House and the Senate.

Senators in both parties have clamored to see the bipartisan conclusions of the panel’s yearslong investigation into Mr. Gaetz’s conduct as part of their vetting of presidential nominees, who normally require Senate confirmation.

But since Mr. Trump named Mr. Gaetz last week as his choice to head the Justice Department, House Republicans have been reluctant to make the report public. And following an hourslong meeting of the secretive ethics panel on Capitol Hill on Wednesday, Representative Michael Guest, the Mississippi Republican who chairs the committee, emerged to say only: “There was no agreement by the committee to release the report.”

He declined to comment further, as did other members of the panel, which includes five Republicans and five Democrats.

Speaker Mike Johnson pressured the committee last week not to release its findings on Mr. Gaetz, arguing that it would constitute a “terrible breach of protocol” to do so after a member had resigned, putting him beyond the panel’s jurisdiction. He also privately urged Mr. Guest not to make the findings public.

Mr. Gaetz abruptly resigned from Congress last week when Mr. Trump announced plans to tap him, days before the Ethics Committee had been set to take a vote on the report. That meeting was then abruptly scrapped.

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