"This was an intentional ambush against two United States federal agents, which I view as an attack against the United States.  Special Agent Jaime Zapata, who was killed, and a fellow agent who survived, were pursued by numerous cartel members and run off the road while driving a US government vehicle with diplomat license plates.  When the agents identified themselves as American diplomats, the cartel members responded by opening fire on the officers.  US law enforcement has operated in Mexico for more than two decades without threat of violence from drug cartels.  This tragic event is a game changer.  The United States will not tolerate acts of violence against its citizens or law enforcement and I believe we must respond forcefully. This should be a long overdue wakeup call for the Obama administration that there is a war on our nation's doorstep."