President Obama is continuing his call for renewed focus on gun control in the aftermath of two mass shootings in the past week. Speaking at a Congressional Black Caucus event on Saturday, Obama said supporters of gun control need to “get back at it” after the Senate defeat of a measure to expand background checks earlier this year. On Sunday, Obama addressed a memorial service for the 12 people killed by a gunman at the Washington Navy Yard last Monday. Obama said the nation’s gun violence should “obsess” all Americans and spark political mobilization.

President Obama: “It ought to be a shock to all of us, as a nation and as a people. It ought to obsess us. It ought to lead to some sort of transformation. That’s what happened in other countries when they experienced similar tragedies. In the United Kingdom, in Australia, when just a single mass shooting occurred in those countries, they understood that there was nothing ordinary about this kind of carnage. They endured great heartbreak, but they also mobilized, and they changed.”

Obama spoke just days after a shooting in Chicago left 13 people injured, including a three-year-old boy. More gun violence in Chicago over the weekend left at least five people dead.