The tradition of keeping the federales out of the Houses of Congress, their offices that directly support Capitol Hill, etc. dates back a long, long way, even before the founding of the Republic.
Besides, any FBI worth it's salt could find all they need on this Jefferson character without breaking into one of the House office buildings.
We should not sacrifice our Constitution simply because the FBI no longer attracts first-class analysts and investigators.
United States citizens have long had the right to be secure in our homes and belongings too. I don't see Congress too upset with "no knock" raids and other intrusions into citizens lives.
Prosecutors asked Congress for help 10 months ago with no response. When one act irresponsibly other steps are taken. Congress acted irresponsibly, they are getting what they deserve.