Homeland Security Secretary Alejandro Mayorkas continues to be the most useless and incompetent Cabinet secretary in recent memory. It is an open question whether he has done anything right in his 3 1/2 years on the job.

Each new detail revealed about the attempted assassination of former President Donald Trump reflects poorly on Mayorkas, both because he oversees the Secret Service and because he declared he has “100% confidence in the director of the United States Secret Service” who oversaw this disaster. The latest revelation is that the Secret Service identified the shooter as a suspicious person an hour before the speech and apparently knew of a possible threat 10 minutes before Trump even walked onstage.