Those questions were asked and answered in the form of presenting probable cause to a judge and securing a search warrant on trump’s lawyer.
So upon what do we base raiding the lawyers of Obama and Hillary?
You're apparently unfamiliar with the subject. But it's ok. I'm here to help.
The investigation is in part to determine the extent that a FISA judge was given false information as a basis for allowing the Obama administration to spy on the Trump Presidential campaign.
The judge is not equipped or allowed to vet v the validity of the information. being secret, Paige did not have the opportunity to ask that false evidence be removed. (Which makes this a big deal)
Since, unlike Trump/Russia collusion their has been much evidence made public that the Obama administration used a Dossier purchased by the DNC/Hillary campaign that was known at the time to be false, this must be investigated and prosecuted appropriately.
IOW, once again unlike the Russia/Trump collusion hoax, there is real, known, and serious evidence of serious crimes.
I hope this brings you up to speed.