My first choice is Their leader ,which includes all aspects , every dimension, every corner of his life., A real broad based investigation will get the quickest results of anyone, They won't have to look far with this monster, second Kavanaugh, the country should have a real investigation of him, he's ugly enough as a person to make a ugly picture of the rights choice to destroy this democracy, to retain there very diminishing support, as the browning of America brings down this group. They know there only hope is to take away the votes of Democrats to stay in power and as a group they are such bad American that they have no qualms about selling out our republic to stay in power. They Need a Kavanaugh type person to do this. Then the son, then the son in law then the daughter. Easy pickings and if they can get the truth out fast enough the investigation won't get in the way or prejudice the lefts new power. That's my order of importance as far as the investigations are concerned , if you have your own feel free to share them.
