Construction of a new White House helipad contributed to radio communication failures that prevented air traffic controllers from hearing Marine Ones required three-minute takeoff warning, federal investigators said. An airline jet was consequently cleared for takeoff as President Donald Trumps helicopter lifted off, bringing the aircraft within 0.8 mile.

Trump was “never in danger” during the incident, the Federal Aviation Administration said.

The ongoing White House construction contributed to radio problems that kept air traffic controllers from hearing calls warning that President Donald Trump's helicopter was…