You're under investigation for abusing your position on the House Appropriations Committee...so you fire the people who investigate that very thing.  Such appears to be the strategy of Rep. Jerry Lewis.  He claims it was a "bipartisan" decision...but it wasn't.

Rep. Lewis (R-CA), the powerful House Appropriations Chairman seems to be feelings the heat of the growing corruption investigation surrounding his ties to a lobbying firm run by ex-Rep. Bill Lowery and money he may have steered to clients of the firm who passed campaign cash his way.   His recent FEC filing shows he's out about $800K in legal fees, and Public Citizen's recently released report shows Lewis to be the top House recipient of lobbyist contributions. 

Definitely fire the investigators...that makes you look really innocent.