Federal investigators have released a preliminary report on an incident involving Marine One. A meeting was held between air traffic controllers and the pilots of President Donald Trump's helicopter to discuss communication issues one week prior to the incident.

Controllers had reported not receiving standard warning calls ahead of Marine One flights. An alternative plan was agreed upon but was unsuccessful on the day of the incident. The incident occurred near Ronald Reagan Washington National Airport on August 4.

Further details on the incident and the investigation are available from the National Transportation Safety Board's report.