On 24 May, 18-year-old Salvador Ramos entered Robb Elementary School in Texas, armed with a handgun and a rifle. He killed nineteen pupils and two teachers before he himself was shot dead. This was the deadliest school attack for a decade. Amid the outpouring of shock and grief, Joe Biden asked, ‘Why do we keep letting this happen? Why are we willing to live with this carnage?’ This tragedy has reignited the debate about guns, particularly since there had already been 27 other school shootings this year. Since his election, the president has made a number of pledges to tighten legislation, but he faces an uphill battle to convert any of them into action, given the fierce opposition from the Republicans and the powerful gun lobby.