"sources say", "from those familiar with the matter", "a spokesperson says" are all tip-offs that you're dealing with a leaker. This was probably deliberately leaked, like a trial balloon to see how the idea went over. Using DoD money wasn't the only idea on how to pay for this wall presented.
Well, there's no way I even want to read all of that omnibus bill but the terms "planned parenthood" and "wall" aren't referenced to once and that is because PP gets the money through Medicaid and "family planning" grants. Now it seems very specific about the border fence, what can go where when and now.
I really doubt Trump will push this, how does doing so NOT violate:
31 U.S.C. 1301 Application
Supposedly, Trump floated the idea by Paul Ryan (who is a recent victim of fake news himself), and Ryan said nothing - Trump has to take this idea back to Congress and it would fail there, Some say he should declare a "national emergency" under the National Emergencies Act, but THAT would be a good case for a lawsuit and it's too jackboot dictator besides.