Rep. Thomas Massie and Second Amendment advocates are pushing back against the Biden administration’s upcoming rule on “ghost guns,” characterizing the rule to rein in privately made firearms without serial numbers as unconstitutional.

“The Constitution does not authorize the federal government to prevent you from making your own firearm. This a fact that has been recognized for 200+ years. Also, Article 1, Section 1 (literally the first operative sentence in the Constitution) says Congress makes law, not POTUS!” Rep. Thomas Massie tweeted Sunday.

Biden will nominate Steve Dettelbach, an Obama-era former U.S. attorney from Ohio, as his nominee to lead the Bureau of Alcohol, Tobacco, Firearms and Explosives on Monday, according to senior administration officials. The President will also deliver remarks from the Rose Garden on measures his administration is taking on gun control and cracking down on “ghost guns,” which are privately made and don’t have serial numbers.