From NRA/ILA:

May 1 is the deadline for public comments concerning a shotgun importation ban that has been proposed by the Bureau of Alcohol, Tobacco, Firearms, and Explosives. A working group within the BATFE has recommended that any shotgun (semi-automatic, pump-action or any other) that has any one of 10 specific features should be banned from importation, on the grounds that such shotguns are not “generally recognized as particularly suitable for a readily adaptable to sporting purposes.”

More details here: NRA-ILA :: Deadline Nears On BATFE Shotgun Ban Comments

There is an email address at the end if you want to comment to the BATF.

Some time ago there was a brief discussion on this topic, I could not find the thread.