The revelation that the FBI botched a potentially life-saving tip on the Florida school shooting suspect is a devastating blow to America’s top law enforcement agency at a time when it is already under extraordinary political pressure.

Even before the startling disclosure that the FBI failed to investigate a warning that the suspect, Nikolas Cruz, could be plotting an attack, the bureau was facing unprecedented criticism from President Donald Trump and other Republicans, who have accused it of partisan bias …

In the Florida school shooting, “somebody made a mistake, somebody did not do their job,” said Jeffrey Ringel, a former FBI agent and Joint Terrorism Task force member who now works for The Soufan Group, a private security firm …