A House ethics committee has launched an investigation into New York Democratic Rep. Charlie Rangel for undisclosed ethics violations, the Associated Press reported Thursday.

Rangel, who resigned from his chairmanship of the House Ways and Means Committee in March following a formal admonishment for two corporately-underwritten Caribbean junkets, will appear next week before a subcommittee of the House Committee on Standards of Official Conduct. Composed of four Republicans and four Democrats, the panel will consider if sufficient evidence exists to prove the allegations against 20-term legislator.

The adjudicatory subcommittee was last impaneled six years ago, when it was called upon to handle the case of Democratic Congressman Jim Traficant, who served seven years on bribery and racketeering-related charges.

In the same way that Republican ethics violations loomed large in the 2006 midterm elections that saw the House of Representatives change hands, Rangel’s ethics misdeeds threaten to undermine Speaker Nancy Pelosi’s pledge to run the “most honest, most open and most ethical Congress in History.”

But for now, the specific nature of charges against Rangel remain unknown — and will likely remain as such until next Thursday when he makes his case to the ethics panel. In the meantime, a list–that is, unfortunately, in no way comprehensive–of the 80-year-old lawmaker’s ethics lapses:

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