As Kagro X details over at Daily Kos, Bush is now claiming a "pocket veto" on the Defense Authorization Bill even though Congress is still in session. In other words, Bush is claiming a right that the Constitution explicitly deems only exists unless Congress is not in session, even though Congress actually is in session.
If Congress can't even determine when it is in session without Bush's agreement, then it is time to do one of two things. First, either abolish Congress altogether, or impeach Bush. After all, the logical conclusion of what Bush is doing here is that he can declare Congress either in or out of session whenever he wishes. In other words, Congress has no power whatsoever to check and balance anything Bush does. It doesn't even have the power to exist unless Bush says it does. If everything else Bush has done so far does not merit impeachment, then surely this level of existential crises does.
Just impeach him already. If you have no power under Bush, and if Bush sets aside the Constitution if an when he pleases, then the only thing left to do to protect Congress and the Constitution is get rid of Bush.
Update: As Lucas O'Connor says in the comments, just because Bush is declaring this a pocket veto, doesn't mean it is a pocket veto. If Congress is still in session, and Bush doesn't act on the bill, simply declare the bill to be law. Then, if the Bush administration refuses to execute the law, start impeaching everyone who refuses to execute it as such.