Gorsuch throws shade at Trump Administration for rewriting federal gun laws without congressional approval-
[reason.com]

After 2017's mass shooting in Las Vegas, Donald Trump vowed to use the powers of the presidency to ban bump stocks, a type of firearm accessory that the shooter reportedly used. "We can do that with an executive order," Trump declared. "I'm going to write the bump stock; essentially, write it out….They're working on it right now, the lawyers."

What the lawyers at the Department of Justice ultimately came up with was a new rule amending "the Bureau of Alcohol, Tobacco, Firearms and Explosives regulations to clarify that [bump-stock-type devices] are 'machineguns' as defined by the National Firearms Act of 1934 and the Gun Control Act of 1968" because "such devices allow a shooter of a semiautomatic firearm to initiate a continuous firing cycle with a single pull of the trigger." The federal ban on machine guns, in other words, would now be interpreted by the Trump administration to cover bump stocks too.