Democratic candidate Hillary Clinton is promising aggressive executive action on gun control if she’s elected president.

“I’m really tired of people in public life saying our thoughts and prayers are with families whose children are murdered in community colleges or elementary schools,” Clinton said today in Davenport.

Clinton suggests Americans should no longer “tolerate” candidates who offer just words and no action when there are mass shootings like the one in Oregon late last week. During a town hall meeting early this afternoon in Davenport, stressed the range of gun control measures she supports. The move highlights differences on the issue with challenger Bernie Sanders who has voted against gun control proposals in the past. Clinton also seemed to strike at Republican candidate Jeb Bush for comments he made last week about responding to a crisis.

“This is not ‘stuff that happens.’ We let it happen and we have to act against those people who should not have guns in the first place,” Clinton said, to applause.

Clinton promises as president she would use executive action to classify high-volume sellers at gun shows as firearm dealers. The move would subject those gun sales to background checks. Clinton also backs a ban that would prevent anyone with a domestic abuse conviction from buying a gun.

Several Republican candidates are campaigning in Iowa today as well, including Bush, Bobby Jindal, Mike Huckabee and Rick Santorum.