Trump's helicopter and a passenger jet briefly were too close near Reagan National Airport, prompting an inquiry into what happened to the safety rules adopted after last year's deadly collision.

The presidential helicopter was involved in a so-called “loss of standard separation,” which requires aircraft to be at least 1.5 miles horizontally and 500 feet vertically away.

The presidential helicopter was involved in a so-called “loss of standard separation,” which requires aircraft to be at least 1.5 miles horizontally and 500 feet vertically away.