US Chief Justice John Roberts on Tuesday rejected a request by gun rights group for an emergency stay of the bump stock ban put in place by the Trump administration.

Bump stocks came to public attention in 2017 after 58 concertgoers were killed in the Las Vegas shooting in which the killer used bump stocks attached to assault style rifles. Congress had proposed legislation to ban bump stocks, but then acting Attorney General Matthew Whitaker changed regulations because, as he saw it, existing federal law allowed the ban, which put bump stocks in the machine guns classification

There is another stay request pending before Justice Sonia Sotomayor, which is also expected to be rejected. The bump stock ban took effect Tuesday.