Raiding a Congressional Office

I wrote yesterday about how disturbing it was to see the FBI, an arm of the Executive Branch, raiding the office of a Congressman, a member of the Legislative Branch. I don't care how corrupt the official is, this is wrong. We've had corrupt Congresspersons for as long as the republic has existed. Heck, we've even has corrupt Presidents. This was an unconstitutional act violating the separation of powers we depend on for the survival of our democracy. No one corrupt Congressperson is worth jeopardizing that for. Certainly there have been other methods for investigating corruption. It's certainly worked for many, many corrupt public officilas over 220 years.

My question is what Judge approved this search warrant? Ok, ok, stop laughing. The concept of the Federal government needing a search warrant is, under George W. Bush, a quaint concept. Still, I can't believe even Alberto Gonzales would allow his FBI agents to raid a Congressional office without first getting a warrant. Who issued such a document and why? That judge should be impeached.