Saturday’s attack at the White House Correspondents' Association Dinner was the third assassination attempt on President Trump.Host Mary Louise Kelly speaks with NPR National Security Correspondent Greg Myre and NPR Justice Correspondent Ryan Lucas about what the attack says about the state of political violence in the U.S. and the debate over whether the Secret Service was ready to protect Trump and those around him. Email the show at sourcesandmethods@npr.orgNPR+ supporters hear every episode without sponsor messages and unlock access to our complete archive. Sign up at plus.npr.org.