Secret Service ramped up security after receiving intel of Iranian plot to assassinate Trump; no known connection to shooting | CNN Politics
Secret Service ramped up security after receiving intel of Iranian plot to assassinate Trump; no known connection to shooting | CNN Politics

www.cnn.com
Secret Service ramped up security after receiving intel of Iranian plot to assassinate Trump; no known connection to shooting | CNN Politics

One could argue they were ineffective in their ramping.
Probably because Trump himself heard them talking about it and ordered them to stop because he's afraid of inclines.