The acting head of the US Secret Service, which did not provide clear guidance or direction to local law enforcement at the time, said a "paradigm shift" was needed after the July 13 shooting of Mr. Trump. Complacency among some staff led to breaches of security protocols. The second assassination attempt against Trump in Florida shows the intensification of the threat environment. The Secret Service needs additional manpower, technical assets, and equipment to meet long- and short-term needs.