Yes, it's a big deal, because one of Trump's favorite tactics is to "leak" something through "anonymous sources" that later falls apart in a spectacularly-public way, leaving egg on the journalists' faces and Trump looking like the legitimate victim of a smear campaign.
The time for "anonymous sources" is over. No more. Back up the information, or don't publish.
The time for "anonymous sources" is over. No more. Back up the information, or don't publish.