President Barack Obama will introduce a package of proposals to cut gun violence tomorrow, including a ban on sales of assault weapons that already faces fierce opposition in Congress even as a majority of the public supports it.

The administration has invited lawmakers to the White House for an announcement on gun violence at 11:45 a.m. tomorrow, according to a Senate aide, who asked for anonymity because the schedule hasn’t been released.

Obama will also ask for universal background checks for firearms buyers and a ban on high-capacity ammunition magazines, according to administration officials who asked for anonymity to discuss details before the event.