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hippyjoe1955 After Lincoln was assassinated... Garfied and McKinley. (And the plot to kill Lincoln was part of a wider plot to kill the vice president, secretary of state and General Grant.)
There was the attempt on president-elect FDR (in an open car) that ended up with the assassination of the mayor of Chicago.
The break-in at the Blair House in an attempt to kill Truman.
JFK (in an open car)
A hijacker that intended to crash a plane into the White House to kill Richard Nixon.
The attempts on Ford and Carter. Reagan being shot.
Nor is that all.
And that's even before mentioning the incredible intelligence failures with Pearl Harbor and 9-11.
There are levels of incompetence that can be find in everything above. As can be found with the attempt on Trump's life.