What do the Feds (or Congress) Need to Get Your Phone Records?
What does the Federal Government, Local Law Enforcement, or even Congress need to obtain your phone records? They just need to ask for them. And you will never know that they did and they have your call records.
Here is a link to an excellent article by Leslie McAdoo Gordon, looking at the history at court cases and statutory authority for these searches.
Be aware. Be afraid. Protect your Privacy.