Not sure Congress could or would do much. They still suffer from jellyspineitis.
Team Obama raises the thread of using the race card, and the Pubbies will cower and capitulate.
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.