WASHINGTON (AP) — Gun rights groups are asking the Supreme Court to stop the Trump administration from beginning to enforce its ban on bump stock devices, which allow semi-automatic weapons to fire like machine guns.

The groups asked the court Monday to get involved in the issue and keep the government from beginning to enforce the ban for now. The ban set to go into effect Tuesday has put the Trump administration in the unusual position of arguing against gun rights groups. It’s unclear how quickly the court will act.

President Donald Trump said last year that the government would move to ban bump stocks. The action followed a 2017 shooting in Las Vegas in which a gunman attached bump stocks to assault-style rifles he used to shoot concertgoers. Fifty-eight people were killed.