From Breitbart:

According to the Wall Street Journal, the ATF is framing the scenario as an expansion of what can be categorized as a “firearm,” a move that “could subject ghost guns to the same regulations as other firearms.”

The ATF’s April Langwell defended the agency’s look into new regulations for such guns, saying, “ATF routinely meets with our regulated industry participants to discuss matters of mutual concern. One of those meetings is scheduled for this week, and ATF looks forward to continuing this important dialogue.”