At least six Democratic presidential candidates are scheduled to attend a forum in Iowa on Saturday organized by gun control advocates in the wake of two mass shootings that killed 31 people in Texas and Ohio.

The forum, sponsored by the groups Everytown for Gun Safety, Moms Demand Action and Students Demand Action, will be held in Des Moines while many Democratic White House hopefuls are in Iowa to campaign.

Already scheduled to attend are Sens. Elizabeth Warren, Bernie Sanders and Amy Klobuchar, as well as Washington Gov. Jay Inslee, former Housing Secretary Julian Castro and Pete Buttigieg, mayor of South Bend, Indiana.

Everytown’s president, John Feinblatt, says, “There has never been a more urgent time for 2020 candidates to tell Americans exactly how they will address gun violence.”