Texts Show How Officers Lost Track of Trump Gunman Thomas Matthew Crooks

Texts made public Sunday revealed Donald Trump’s would-be assassin was flagged as suspicious at least 90 minutes before he opened fire at a Pennsylvania rally this month.

But despite the repeated communications between officers at the site, none of the officers nearby moved to intercept Thomas Matthew Crooks, eventually losing track of him.

The messages, obtained by The New York Times, raise further questions about how law enforcement allowed Crooks, a 20-year-old...