The sheer number of mass shootings in America means that presidents – and recent presidents more than most — have had to deal with the aftermath.

Former President Obama addressed mass shootings roughly 18 times during his administration, with some of his most damning comments coming exactly two years before this weekend’s deadly shooting in Las Vegas.

For Obama, it was the shooting at a community college in Roseburg, Oregon, where nine people were killed Oct. 1, 2015. And for President Trump, it was the Sunday shooting at a country music concert in Las Vegas, where at least 59 people were killed and 527 others injured.

While both mass shootings included deaths, life-saving first responders and acts of heroism, the two presidents’ responses were starkly different.