Donald Trump has just tossed the responsibility for this investigation over to Congress, and yet he has access to all of the information that would come out in an investigation anyway -- so he knows what they have to find in their investigation.
This move isn't intended to push the story out of the spotlight by turning everything over to a bunch of useless jerks. It's intended to make those useless jerks do Trump's dirty work for him.
/\/\
This
Ohhhh now those are —good— points!!
President Trump plays 3-D chess...
Also, if Congress shirks their duty, President Trump can place the matter in the hands of the DOJ... who will, by then, have non-Obama appointees under Jeff Sessions.