US President Donald Trump’s Marine One helicopter nearly collided with a passenger jet earlier this month after a radio failure prevented air traffic controllers from receiving its takeoff warning, federal investigators said on Thursday.

The August 4 incident occurred near Ronald Reagan Washington National Airport as Marine One departed the White House area with Trump aboard. An Envoy Air passenger jet was cleared for takeoff at roughly the same time.

The two aircraft came within about 1.5 km horizontally and just 215 meters vertically of each other, triggering an automated collision warning aboard the passenger jet. Marine One’s pilots spotted the aircraft and briefly halted their flight until it had passed.

Under standard procedures, the presidential helicopter was required to notify Reagan airport controllers three minutes before lifting off. Recordings show Marine One made the required call, but the tower did not properly receive it.

Investigators found that the communication problem was already known. Just a week earlier, Marine One pilots and Reagan airport controllers had met to discuss repeated failures by the tower to receive the helicopter’s three-minute takeoff warnings.

As a precaution, they agreed that another military facility would relay the warning whenever direct communication failed. That backup system also failed on August 4, leaving controllers unaware that Marine One was taking off.

Investigators traced the radio problems partly to construction at the White House, which had forced Marine One to use a temporary takeoff site with poor radio coverage. The report did not specify the project, though the White House has been undergoing construction on both a new ballroom and a permanent helipad.

US aviation authorities have since relocated radio equipment at Reagan National to improve communications.

The near-miss came less than two years after an American Airlines regional jet collided with a US Army Black Hawk helicopter near the same airport in January 2025, killing all 67 people aboard the two aircraft.

Following that disaster, US aviation authorities permanently restricted helicopter operations around Reagan National and introduced additional safeguards aimed at preventing commercial aircraft and helicopters from crossing paths.

Under current procedures, commercial flights must also be suspended whenever Marine One operates in the airport’s airspace.