The Secret Service had the former F.B.I. director James B. Comey followed by law enforcement authorities in unmarked cars and street clothes and tracked the location of his cellphone the day after he...

The Secret Service said on Thursday that it was suspending six agents involved in securing the site of a campaign rally where a gunman tried to assassinate Donald J. Trump last summer.

Following the shooting, lawmakers from both parties questioned the security failures at the rally.

The Trump administration has put two repeated targets of President Donald Trump under criminal investigation, although details of what exactly they are being investigated for or how far the Justice Department intends on taking the probes are unclear.