The death of constitutional liberties often tends to occur gradually, with one seemingly minor step at a time:

President Trump on Tuesday said he has directed Attorney General Jeff Sessions to draft regulations that would ban any devices that would turn legal, semi-automatic firearms into automatic weapons, after studying the issue of bump stocks in light of the Las Vegas shooting in October. The president made the remarks from the White House East Room, as he hosted the Public Safety Medal of Valor Awards Ceremony.

https://www.cbsnews.com/news/trump-bump-stock-ban-guns-regulation-shooting/