Here's the thing.  

The HIC (house intelligence committee)  has been demanding proof from the White House now for .. what? 3 weeks.  While stuff is leaked to the media they have been given "nothing" (That committee is chalked full with Democrats btw)  The Transition team is also asking for information and has also been rebuffed, so has the media.. (outside of talking points)

For the President to take this action... without giving some hard evidence is kind of baffling.  His side is asking for it to.