The law provides a procedure for expedited consideration in the Senate. If the committee to which a joint resolution is referred has not reported it out within 20 calendar days after referral, it may be discharged from further consideration by a written petition of 30 Members of the Senate, at which point the measure is placed on the calendar, and it is in order at any time for a Senator to move to proceed to the joint resolution.[7] If the Senate agrees to the motion to proceed, debate on the floor is limited to 10 hours and no amendments to the resolution or motions to proceed to other business are in order, and so the Senate may pass the joint resolution with a simple majority.[7] A joint resolution of disapproval meeting certain criteria cannot be filibustered.[8]
Probably with good reason too, since if I'm understanding the US system correctly proposed regulations are created by unelected officials and can come into effect without any congressional vote whatsoever. Allowing filibustering of CRA votes would mean that regulations could be created despite the majority of the Senate and House strongly opposing them.
Not really -- rulemaking from the executive branch agencies is supposed to be what takes laws and implements them into concrete policy. The CRA is supposed to allow Congress the ability to void the rules that are perceived as going against the spirit of the law that was passed.
I haven't seen any reporting on a specific law that these rules were tied to, but I have seen references made to laws predating the public internet that mandate privacy on phone calls that.
https://en.wikipedia.org/wiki/Congressional_Review_Act
Relevant section:
The law provides a procedure for expedited consideration in the Senate. If the committee to which a joint resolution is referred has not reported it out within 20 calendar days after referral, it may be discharged from further consideration by a written petition of 30 Members of the Senate, at which point the measure is placed on the calendar, and it is in order at any time for a Senator to move to proceed to the joint resolution.[7] If the Senate agrees to the motion to proceed, debate on the floor is limited to 10 hours and no amendments to the resolution or motions to proceed to other business are in order, and so the Senate may pass the joint resolution with a simple majority.[7] A joint resolution of disapproval meeting certain criteria cannot be filibustered.[8]